yes
Yes - you can play any game in the home english on a jap NGH system using the debug bios
However, you can only run games made before 98 in MVS mode. There may be a few 1998 games that will run in MVS mode, but most won't.
This really isn't a big deal though. Most of the games that were censored (Samsho's, slugs, etc.) were made before 98. After that they pretty much relaxed the whole English censorship thing. So those are really the only ones you might wanna run in English MVS mode, the others you may as well run in home English mode.