iirc noone had any luck injecting arcade games as yet, i do know Ninja-kun Majō no Bōken got released as a Famicom Vc though. There was someone specializing in NEO-GEO injects, i think it was sr_corsario. Anyway try searching google for torrent neo geo injects, as im not sure if the wads are on wiiso.
Dragon Slayer was officially release in Japan, do you want that? or do you want an english translated inject - i have both...
It would be easier if you specify what regions/language your requests are for, and if you need specifically the console version you want since many were released on other consoles(eg, Golden axe got releases on Arcade VC also)
anyway for now i have Cosmic Fantasy 2 (its the ENG game from Working Designs)