Given that the pistons (from KS at least) are precisely the same casting for all variants from 34.15 to 35 CH, taking material from the top of the crown isn't an issue IMO, I myself have taken a regular Mondial and KS pistons from 34.7 and 34.45 piston and reduced the CH to 33.5 with no issue several times. Many more modern engines, and variations of the sohc architecture (like the bravo dohc engine) use a much smaller width above the top ring land, the sohc engine by comparison is very wide, and that's dead space you want to minimise, for both performance and emissions.
Personally I would be aiming a little higher with the static CR ... and that will open up more options for camshaft choice (longer duration) as it's not really static CR that's the be all and end all, it's the dynamic CR you achieve when you factor in the fact that the inlet valve closes well after the piston is on it's way back up the bore after BDC.
The 1600 I built for Mark in Sydney was a measured 11.4:1 static. For that engine I started with Mondial 34.45CH small flycut pistons and machined the CH down to 33.5 and left a 0.95mm half dome, after th block was skimmed the piston crown was 0.05 plus deck so the top of the dome was 1mm plus deck, with the 42/82 10.6 lift cam I fitted the simple dynamic was 9.75:1 from memory... if your running twin carbs and at sea level you can work on a simple dynamic of 9.5 - 9.75 pretty safely with regular pump premium fuel... if the static CR isn't around 11:1 the dynamic CR will be quite low if you use a cam of 300 degrees duration or more.
you need to measure your combustion chamber volumes, and perhaps rethink your choice of a 1.5 crushed head gasket, you really want to get the SQ down to approx 1mm - 1.2mm.
If you alter the CH of the pistons, be certain to clamp the piston via the gudgeon pin / pin bores... don't use the ring grooves as they have a much bigger potential for variation and not being quite square (as I found out the hard way)
Even with the deep / large flycuts in the KS piston crowns you will need to enlarge one side for the intake valve... that's if you are aiming for a decent output of more than 100hp at the wheels.
SteveC