That proposed alliance sounds doable! I think problems would mostly arise if the yakuza started nabbing Albero's clientele (ex. infringing on their turf, location-wise and/or business-wise), but you've said the yakuza would keep to their territory, so problems of that nature will have been avoided.

Would the yakuza be willing to obtain things for Albero that Albero could not obtain himself (because of the Asian vs non-Asian mentality)? They wouldn't have to, but it would strengthen the alliance if they did.