I think it would be really too boring to create the same mod just in a different engine, the time would be better spent making something new to enjoy.
edit-- some suggestions
Destiny of Dendor
Fate of Fendor
I don't agree with you, I think recreate current PoP in bannerlord would make the game much more interesting and playable, I had played bannerlord for about 200 hours, feeling the game in depth by many aspects, and everytime I understand a mechanic I see more hope for POP in bannerlord.
e.g.
- Bannerlord uses RNG companions, in POP we could create RNG companions from various KOs, which makes the game more immersive.
- The clan system will benefit POP more as household is a important role in POP lore, KOs and minor factions could use clan system as well.
- The death&replace character you are playing system could give POP double chances for character build, like you can switch from 2 characters, hero of Mordigan(OP stats to fit the lore of POP), and a random adventurer like vanillia game(a second character you can control, which is just a normal human without OP stats), to both roleplay as the chosen of pendor and an adventurer raised from normal people.
- The perk system of bannerlord is pretty flexible and interesting, in POP we could make characters more "fantasy", like block arrows with swords, like area damage, superhuman speed, which are already things in bannnerlord 1.4.
Nevertheless bannerlord had too many QoL improvements and realistic economy, all of those would make players enjoy POP more.