Getting FLI to put a 6303 chip in your Microline camera would be an obvious solution - the best QE in the medium-large sized class of chips without going to the back thinned ones. Not a cheap chip to buy in class 1 I'd imagine. The 6303 is pretty noisy and would greatly benefit from the superb cooling of the microline - this would be infinitely superior to the 8300 with the CDK if you can stand the blooming. I find the blooming in my 6303 nearly always manageable - except if you go for fields with very bright stars of course. There are also impressive deep wide field NB pics taken with 6303s and FSQs such as my namesake, Neil Fleming. So the 6303 is quite versatile - as is of coure the 'legendary' ST10.
It will be interesting to see how your new reducer goes - hopefully it preserves your current illumination and flat field.
Forgive me if I'm stating the obvious...
guy