In theory, that's feasible canonically, but Stands [i]are[/i] their own special thing. That is kind of the point, a core theme of them even.
As long as being able to see them doesn't translate to being able to actually hurt them however, I wouldn't be too fussed. Still means it should be invisible to the vast majority. I'm a bit of a stickler for canonical accuracy if I'm going to play a preexisting character, so I'd rather hope to not have the entire premise of Stands undermined, especially given the fact that we have Ben freaking 10 (who is actually nuts, given he should still have Way Big) and Terra (self-explanatory). Bruno is also the only hero so far, aside from Merlin, that cannot feasibly (within a reasonable time/with reasonable ease) destroy a city/army without some extreme liberties being taken, so in terms of "special club" stuff, I really don't see the issue in this area. Bruno has his areas of expertise, and he is most certainly vastly outclassed by his potential teammates in multiple areas of their own.

Oh, and on that thought, I think the Omnitrix may be able to scan Buccirati, given that Stands are genetic after exposure to the virus that grants them. Granted, the virus may also be more spiritual in nature (heavily implied by the core plot of Part 3), and Ben would only get a Stand unique to himself out of the deal. There's also the fact that he may have to actually pass the Test of Worthiness given by the virus, which should be no issue for someone like him honestly, but it's there.