Thanks for the steer. But ouch that's not so easy. Ceiling is coved and over tiled with very pricey Italian glass tiles .... yes sounds awful but isn't :-)
No I need to install via the downlighter and speaker openings. There are in fairness 2 6" speaker voids and 9 68mm downlighter openings ... enough in reality to at least get injection access to pretty much all the noggin braces voids.
Have been reading about these small scale foam injection kits. Whilst previously I'd steer away from these, the voids are bone dry and sealed on all sides so risk is minimal i'd think.
Of more concern is the electrics and audio etc. Technically can see little practical reason why there should be any negative effect but doesn't feel the right thing to do somehow.
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