You CAN find an M-Tec T630 (68030@42Mhz) board from Animart at 90 Euro. I bought one recently and I'm very happy! I also bought from Animart an 68882@40Mhz FPU. The site is
www.animart.pl but you can reach them only by mail.
Congratulation on buying the A600.
You can mount your HD in your PC using UAE and install everything from scratch and then put the HD back in the miggy.
Don't hesitate to PM if you have any question. I believe also that on Vesalia you can find a DD internal drive.