Just bring Charlie or Toriyama guy back. He broke up with his girlfriend in the village so he comes back to town and finds Suguha without a man to please. Suguha will use the techniques Hebishima taught her to heal his broken heart and penis. Great ending! Everyone happy!
People should understand at this point that regardless of what they went or how they think is 'boring' that if Hebishima is removed there is not gonna be "anyone else" she's "given" to, really XD Either she stays with Hebishima or she's plot-handled to Inoda if the former vanishes, Fujino specifically got rid of the other 'relevant' NPCs and he's not gonna bring them back, hell, if Hebishima wasn't vital to Sinon and Suguha's plot he clearly would have gotten rid of him too when he made all the changes for Part 2, the mere fact he's considering to get rid of him at all because people complained about the focus on the non-Inoda things basically confirms that (Also, is kinda a rule for NTR worlds that the 'NTR guys' never get anything good, sadly a sad cliche, so Charlie is destined to forever be a cuck just by that rule, Fujino doesn't break from the eternal-NTR-tropes as much as his writing may be more complex than the usual H-doujins :3)
Klein COULD be an option if, well, it was anyone but Klein honestly. I'm still not 100% sure if he would even keep Alice, not with the sex trafficking ring clearly on their tails, Klein's negative luck when it comes to women is legendary and it would be on brand for him to get to fuck Alice only for her to them be stolen by the criminals. Unless as mentioned early Kirito and the group manage to do an usually-impossible-twist for NTR worlds and actually manage to successful defeat and arrest those dudes XP
However I believe that at this point we should once again shift our focus to more immediate things...should be only hours left for the update to release everyone! Are you all ready?