Apu is a complex and multifaceted character that fans have many reasons to love. But no matter how lovable the character is, I don't think it's right to say that the good parts of the character can just cancel out or erase his problematic origins.
Most importantly though, if Hank has decided he does not want to voice the character, that is his right to do so and it would not be right to force him back into the role.
Really though, the best solution is to just... let the Simpsons end already. It had a good run, but it's been trash for far longer than it was originally good. Are you sure you really want Apu back on the new seasons today, or do you just want your nostalgia for classic Simpsons? Because the latter is something you can already have, no one's taking that away.
I hate the DNC as much as you do, bit the DNC is not the state.