Legend, I've attempted to some degree getting the NES Zelda's overworld hacked so it resembles the BS Zelda map. It appears even that is pretty difficult, though.
Here is a thread where we were discussing it in the BS Zelda forums.http://z9.invisionfree.com/bszelda/index.php?showtopic=1338
The subject of doing the inverse and porting the NES Zelda maps over to BS Zelda was also discussed. Based on Mottzilla's own word, it seems the primary issues would be the World Map aesthetics and the missing enemies.
I've also thought of another hack idea in the meantime;
I have a Powerpak, and currently that does not support the MMC5 version of Castlevania 3: Dracula's Curse. It does support the VRC6 Akumajou Densetsu, but as I'm running this on a regular old NES, it does not have the extra sound support. I do not want to attempt to mod my NES hardware for the sound support for various reasons (among them being that I suck with a soldering iron). And my current TV setup does not like Famicoms.
Is it perhaps possible that the simpler-sounding MMC5 Castlevania 3 sound can be ported over to the VRC6 Akumajou Densetsu, or the music be rewritten in some other manner so that the extra soundchips aren't used? Yeah, I know playing VRC6 Akumajou Densetsu without the enhanced music is like buying a cassette over a CD, but this is basically just so I could have a version of Dracula's Curse that plays completely on my NES.
EDIT: Welp, guess I'm gonn have to pass the buck on the NES2BS Zelda...
Under the limittations of Dungeon Master, hacking the BS Zelda Maps into NES Zelda looks like it'll be impossible.
While BS Zelda's overworld is smaller, it turns out most of the dungeons tend to take up more horizontal and vertical space than the original Zelda maps.Perhaps to compensate for the lack of a Level 9? But yeah, in general, the BS Zelda dungeon maps appear to be bigger. But more importantly in the case of how Dungeon Master works, the "St.GIGA" shape does not appear to fit in the limited space I'm provided to work with hacking the dungeon layouts.
Presumably due to how the game itself is programmed, Dungeon Master has some very strict rules for putting maps in, and attempting to put in exact replicas of the BS Zelda Maps appears to break them simply in the overall layout.
Now, since I'm basically a hacking n00b, it appears to me that the options I have left involve sacrificing perfect replicas in order to simply get the important stuff in.
But alas, sacrificing the ideal of the vision sucks...