Agreed, the forum should be split. AFAIK the internal h/w of the Compaq & eMachines boxes are different, so any hacks are likely to be specific to each.
I'm most interested the the eMachines, assuming Tiger are about to start selling them. Would it be possible for you to post a photo or scan of the board, so we can start work on identifying the components it uses.
The main h/w to be 'tweaked' is the flash chip. Key to this is finding alternative ways of booting. Someone in another thread seemed to suggest it will boot from a USB-zip, which sounds promising.
The other option would be from a plug-in flash card, if it has an exapnsion slot (like the Audrey). Again a photo would help determine this.