As Sizemore said, the thing that made Bogroll special was that he had a good heart, which was a rare thing in a Twoll.
I really doubt that, if his corpse was re-animated into a mockery of life, with his memories intact but his outlook subtly changed and darkened (like Ansom), that he would still have that good heart. Bringing him back would have destroyed that innocence and eagerness-to-please that made him him.
A De-Crypted Bogroll would not have been a happy ending, it would have been tragic.
A bogroll who regenerated on his own, despite having his body burned, due to some funky loophole I can't think of right now, that would be awesome.
A new one-eyed Twoll, popped fresh and assigned to Parson as lackey; a blank slate with no memories and little personality, but some essential bogrolliness, for Parson to teach, nurture and grow into what Bogroll could have been...eh. I'd take it.