Honestly, I think Bioware do a good task of appealing to JRPG enthusiasts as it is. Honestly, most of the reasons I like Bioware games are for the same reasons I like JRPGs. I mean, I guess they could have more stupid hair, but that's more of a modern trope rather than a core of the genre (I mean think back on the classic pre-FF7 JRPGs, where the spritework was such that even if the characters dressed in leotards and had stupid hair you didn't actually notice). Technically, JRPG strengths are (ideally) in the form of native and characterisation. Bioware RPGs are already relatively close to a lot of things that make JRPGs good, and are significantly better at it than a large number of modern JRPGs, with a few notable exceptions. They also already have the giant swords and overly dramatic attacks, which are staples I generally enjoy. More overdramatic boss battles would be appreciated, in the vein of Ancient Rock Wraith, Corypheus and Duke Prosper.
Ideally, one might say that JRPGs tend to have a far more integrated cast in the sense that all companions have strong reasons for being in the party and have unique arcs that tie directly into the main story, but this is frequently not the case in a lot of JRPGs anyway, where in a cast of even 6 about 3 will be mostly incidental to the storyline. In reality this isn't too different from DAO, where the Warden, Alistair and Morrigan were plot-central, Oghren and (arguably) Shale tied closely to a specific questline, and the others were mostly there for flavour, having small but mostly incidental arcs in terms of the larger plot. Overall, though, I'd say that classic JRPGs tend to be far more party-centric than WRPGs, which tend to be centred more not the epic protagonist and their journey. Bioware are already somewhat less-so than some other WRPGs (with DAII perhaps being the epitome of this trend, with Hawke serving mainly as part/heart of an ensemble cast).