I don't think we can help on the 'skins', but I can certainly fix your Sony problem.
Try the attached Custom Remote which has the Disk+/- mapped to the Ch+/- button.
Assuming it works, there are about 2 0 functions I haven't implemented and you have the Pg+/-, 5 x Colour buttons and 15 Custom Remote buttons that are free. So you tell me which function you want on each button and I will do it.
Sony DVP-CX875P DVD.zip 3.7 K