I'm personally not a fan of force-feeding solid food...you can get a much better quality & quantity of food into a weak snake by tube-feeding...have you ever done that?
If you need tips on 'how-to' just holler...and you're right, since he has multiple issues it's HIGHLY unlikely that he'll eat after being handled & soaked b.i.d. (twice/day).
Hint: this is what you use to "tube-feed"- it's a very flexible round-tipped human medical-grade urethral catheter...the holes are NEAR the tip but not right at the
end, so it's gentle to tissues when inserted into a snake's throat.