Galibier questions

My wife has agreed to let me get a new turntable, so I'm seriously thinking of something in the Galibier / Teres lineage. My first choice is a Gavia with the Serac platter - I'd love to spring for the TPI platter, but I think that might be a stretch. Or I downgrade my tonearm plan (a triplanar.) I have 2 questions:
1) Has anyone tried a graphite mat, say a Boston Audio, on the Serac platter?
2) Reading through the isolation/support faq, I don't see any mention of using a Symposium platform. Has anybody tried that, maybe with a set of Stillpoints underneath?

Thanks