Leander is mostly right I think.
Just use/integrate UAE for classic support and...
As going/staying ppc requires very specific and expensive hardware, I don't see why x86 could not be supported in a similar way ?
I mean... just test/release for 1 to 2 mainboards and perhaps 1-2 cpu's.... write drivers for those, and specifically say other ones are not supported. I admit you would need to repeat this each years... but it seems doable to me.
just a thought
Tom UK