This is from Castlevania 2 right? lol
I really dont know, since HoD can be revamped easily with SotN graphics it would be faster (also no one did a Metroidvania remake yet) and would need less story to be made, since its already good and only needs some tweaks. Sure, we can add more features, but its not needed to really be a good game.
In CV2 we would need to choose bosses, rework almost all the map (not location places, but their layout), choose more musics and add a lot to the plot.
I can give you a 3rd option, one that I remembered only yesterday that being LEgends. I dont know if you are interested in this game, but a suggestion doesnt hurt anyone right? xD
Since it really tried to be like a Metroidvania (JP version features a save system instead of password, a lot of optional features that changes the ending, conversation, trap rooms, magic instead of subs, branching paths in stages, etc.) we could try to do something with it, or even transform it in a Metroidvania without level ups.
The problem is that it would be even more troublesome, since it would be a even more harder task. I tried to give a better suggestion only to worsen the things and notice it in this last paragraph, damn :-/