As an aside from this, I've found the perfect MC to be using with single pot calipers too.
It's a Volvo 240 stepped cylinder with 22.22mm and 15.87mm outlets which should give some nice balance. Thanks to EvilC for advice and mutual rambling about brakes and the like.
No need for a balance box, new pedals or expensive modifications, maybe relocation of holes to mount and a 4 way (M10x1) brake union too.
Result for all those wanting brake upgrades on the cheap