They've already done a live action adaptation of the original game back in 2006. It was a bit.... odd, and definitely not the way you'd wanna experience the yakuza 1 story for the first time, but it is an entertaining enough shitshow of a time for people that just want more yakuza.

(Also the entire thing is on YouTube but don't tell Sega that)

Honestly, if you own new Vegas have a look at tale of two wastelands. It ports over all of fallout 3 into the new Vegas engine, and with it brings all the upgrades that the nv engine has, like stability (after installing the 20 or so mods needed), iron sights, and all the increased mod support fnv has.

Since I'm not particularly sure the mods will be particularly happy about people posting links to hentai in the comments of a post than hasn't been marked as 18+, I'll message you the barbeque sauce