Bochs, perhaps?
I've used Bochs under Linux with varying degrees of success (it's a little slow). But, if there's not a suitable Wine solution for you, then Bochs would be your next hope.
Just out of curiosity: is it personal choice, or some kind of need keeping you on BeOS? It's a really neat OS, but with such little support now a days, I don't think I personally could use it and be productive.