Or you can go see hese over @ Amibay and buy one of his Amiga
AA3000+ motherboards with AGA Chipset, SCSI II, DSP Sound, 24Bit Flicker Fixer, PCI Riser card etc...
This was the Amiga that every Amiga Fanboy back in the day, wanted..... hese is your man.
Otherwise and as alexh advises above....
Chuck an A4091 into your A4KD, but be sure you have a Rev 11 Buster after buying one @ organ donor prices.
(....if you can find one)