Well, yes, we have thought of that. We were actually able to make a patch (sample) from my Sonar and she imported it as an SFX file into her player, so we're able to use it. Fortunately, it's just a simple sound that doesn't arpeggiate - as the one we're using in Rapture does! I love Rapture so much I bought it, and she has it installed on her system and now we're able to use it live. (winning). The only bad thing about this is that the note changes across the spectrum and with the note we sampled we are stuck with one, but it totally works well enough for live. So it's slightly different, but it works.
Anyway, thank you for your advice and insight. It would have been nice to have the synth itself on her system; there are a few on there she would have loved to play with, and it is a bit cumbersome to make patches, but it is what we will do if the need arises.
I did contact Roland (per Cakewalk support), and they do not make a standalone version of the synth unfortunately. Seems a bit silly, and like it would be easy enough to do since it's software. ;)