Use the Snow Leopard Installer to install a copy of Snow Leopard onto a USB hard drive. (For these purposes, don't just clone the SL DVD onto a hard drive.) Once it's installed, the same OS and applications will work on any Intel Mac that wasn't just released a few days ago.
It sounds like you've done quite a bit with modifying DVD Player, and I appreciate your experience. But the operating system isn't tailored to a particular computer. You could even remove your MBP's internal drive, place it in a USB enclosure, boot your MBA from it, and expect it to work perfectly.
It sounds like you've done quite a bit with modifying DVD Player, and I appreciate your experience. But the operating system isn't tailored to a particular computer. You could even remove your MBP's internal drive, place it in a USB enclosure, boot your MBA from it, and expect it to work perfectly.