I'm fairly sure porting mixxx with adjusted skin is the best way forward. in fact I'll try compiling mixxx in scratchbox for the hell of it (hell, with usb-hostmode I could [in theory, I doubt N900 has the power to handle control vinyls] hook up my Serato HW to it)

edit: running into weird issues with scons ("make replacement" I'm not familiar with) and I have other things to do as well so if someone else has gobs of spare time please take a look...