Getting worried-----

The Wallace calculator says a true 9.7 Scr will come in around 8.2 Dcr.(EDITThat is to say, if you build it to a true 9.7Scr) This should run on pump-gas easy. This is with an ICA of 56*, which is your cam, in at 106*. So with careful measurement, as mentioned, this looks doable.
But. You said you're not quite married to that cam, so why not wait to see what the exact Scr dials in at? Then reassess the cam possibilities. If the Scr really comes in at over 10, then worry about Dcr. JMO

EDIT And this is to say, wait til after you get it all measured up. Then if the Scr is too high for your cam, you have 2 choices 1) a later closing intake, or 2) a lil more chamber volume. But if the Scr comes a lil low for your cam choice, you have the opposite choices; an earlier closing intake valve., or a lil less chamber volume.

To change the chamber volume, you can play with gasket thicknesses, or shave the pistons, or swap to the later 60cc heads.
I think it all hinges on just where your Scr can be adjusted to.It looks like you have a fair amount of choices to play with.
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FWIW, I like to run on the ragged edge of very nearly too much compression. That way I can run 91 on the weekend, when I'm likely to stand on it, but run 87 the rest of the time, letting the compression really work for me.