Hi --
I caught your post on YamahaSynth.com.
Unfortunately, the main problem is that Montage Performances and PSR/Genos styles are not equivalent. When Yamaha created Motif (XS and later) arpeggios, they mined PSR/Tyros styles to obtain the base musical phrases that make up arpeggios. (Yamaha also mined its beatboxes like the RMX, etc.) So, the arpeggios are effectively deconstructed styles.
Rather than re-assemble the arpeggios into PSR/Tyros equivalents, the Motif developers combined arpeggios (phrases) into Performances that are geared for contemporary music. The Motif/MOX Performances are definitely hipper than PSR/Tyros styles and are stripped down to 4-part drum, bass, guitar and (optional) sweetener. Motif/Montage has a lot more depth in contemporary areas like EDM, hip hop, R&B, funk.
Music Finder is supported directly on PSR/Genos although there are a few PC-based tools for manipulating Music Finder (MFD) files. The Music Finder is an integrated feature in PSR/Genos. So, when a user selects a Music Finder entry, the keyboard interprets the entry and turns it into local keyboard actions to select a style and so forth. I don't think you'll be able to add this capable to Montage itself.
I spent a bunch of time exploring arpeggio/style relationship. One project re-assembled some of MOX Performances into styles:
http://sandsoftwaresound.net/mox-const-kits-update-v2/and vice versa:
http://sandsoftwaresound.net/motif-styles-for-your-arranger/All said, I hope this isn't too discouraging. You may have a different concept in mind and I'm sure that other folks will be interested, too.
BTW, I'm currently playing MODX, Genos and Reface YC in terms of Yamaha gear. I recently upgraded to MODX from MOX. Who could resist a lighter weight, almost a Montage?
All the best -- pj