I'm not a regular medic player, but I always advocated the dual medic rifle. Lightweight, easy and does the job, be a dart dispenser and if you need trash clearing just grab a Lever-action already. Stand behind, and just heal people; stop shooting at the trash with medic rifles unless needed, use your sidearms to clear trash to avoid long reload times.
That's it, you're a good medic who helps a Hell on Earth team.
Unless you go front to spam dual flare revolvers blinding teammates and reload often, never heal or feed yourself to a Siren bomb while shooting crawlers with MP7M, you're fine.
As for @OP; in none of your "setups" you can utilize the pipebombs. It's a waste of good money at higher difficulties when you can share it among recently dead players.
A blowerthrower would abuse the prematurely setting the pipe off for a greater good; killing 6p HoE FP with a single pipe blast when set by BT. Same thing can be done with any medic rifle, but for ensuring maximum damage and practice of darting pipe in FP's path then backing away in time to set it off before it arms; I suggest getting a Blowerthrower. Sirens can be brought down with BT without too much aiming involved either.
Offperk MK23 for pre-damage with xbow combinated, can induce slow-rage bug on Scrakes, also can get rid of Husks with ease. Get rid of pipes and machete, you don't need a machete unless you're in for cool Scrake flinch instakill tricks, alter-swing of knife would chop the lesser specimen heads with ease afterall.
No medic rifle with Hunting and Katana is just a
TERRIBLE idea, as other players in a pub would definitely kickvote you out. And I don't think none of your friends would like to suffer the consequences of it. If same setup would get you a good kickvote out from a pub game, why they should bother carrying you around?
There are way more harsh words for what are you trying to do, but the least insulting one would be tagging you as a "griefer" or a "newbie". Telling players that this setup works would be pretty misleading. Yea, that would work at Normal and Hard servers but I don't think that'd be the case with Suicidal or Hell. I don't think it's possible to beat a 6p HoE game with this setup either.
Katana in a high difficulty server would get your armor chipped away by Crawlers or Gorefasts. While your teammates would expect you to tank that enraged Fleshpound (considering you're holing up somewhere) when you hold a Hunting Shotgun. Sooner or later you'll run outta shells on it or your armor will wore off from melee engages, whichever is first; you'll fail.
Add salt to the injury as being unable of healing from long range when Fleshpound goes close to one of your teammates. Trying to aggro them would be pointless as they always pick their target on proximity, which ends you up with a dead teammate if you can't heal them from distance. If you want Hunting, ditch the Katana or vice versa, you're not a Support Specialist. However, if you grab chete instead of Katana you can flinch-uppercut kill Scrakes after a bit of predamage to them when needed.
I don't think it would be possible to beat 6p HoE with this setup too. HSG-1 offperk just tickles if you fail to aim in a panic situation and when offperk'd, Shotgun is much better than HSG-1. Please don't blabber bullcr*p about its magazine size and shiz; "weakest pellet damage" is all you need to know. It's not an upgrade to normal Shotgun, using it offperk without any damage boost would be silly. Your medic rifles have long magazine reloads already, you would do better with an interruptable reload weapon next to it.
A Lever-action, Blowerthrower or offperk M32 (when you go demo at late waves to refill your pipes perhaps? learn when to shoot it thou, k?) would work way better than HSG-1 if you really want something reliable, yet get to keep the Katana and medic rifle next to it.
Sure you can provide husk and siren support, but a sharpshooter does that anyway and does more damage with the crossbow in the first place.
Sharp don't deal higher damage with crossbow on a bodyshot, a xbow medic saves Sharp's ammunition for him to deal with bigger targets instead of wasting it on smaller head health targets like Husk and Siren. A medic never suppose to take attention of Scrakes or slow pace Fleshpounds with crossbow.
Sending a 2880 damage onperk bolt headshot to a 438 head health husk/siren would be the same with sending it a 1200 damage offperk bolt headshot afterall. One shot, one kill; so Sharp aims down on Scrake first instead of losing time with Siren or Husk.