There were rumors a few years ago about being able to reflash an A1 to
run MOS, since the chipset is the same. But, it was in no way
official and I kinda doubt anyone would tell you how it was done
But the reply suggesting you sell your A1 while it is still worth
bucks, is probably the best route to go with.
For what you get out the A1, you are (1) cut loose from a buggy piece
of hardware with no known support and (2) will get enough money from
some rabid purist that you can probably buy at least a PegasosII bare
motherboard, possibly even most of a complete PegII system. Which
will run, work, and has support..
Now, if only MorphOS would run on that Sawtooth AGP Mac motherboard
I've got lying around the house!