If you ask me, that perfect port could be the Scid engine with the Miniature UI. It would be nice to know whether engine and UI are well layered in Scid or not. The pragmatical proposal would be to concentrate on the current phases in order to have a first shot to the Miniature UI and them contact them with questions. Asking now while we are still vaporware...

If in the meantime someone wants to make an ugly but fully functional port (stylus UI etc) it might be relatively feasible (says me, a non-developer). See the dependencies: http://packages.debian.org/lenny/scid