@Darrin
have 2 A1200 towers and one of them has the Power Flyer Gold IDE adapter in it which blocks off the clock port (and was a {bleep} for fitting an internal scan doubler).
I had no problems with fitting my fast serial port into the clockport with a Power Flyer Gold, but the scandoubler did need a trim.
Sadly the new Indivision scandoubler wont fit with Fast ATA + Mediator and now the IDE Express looks to be sold out.