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Not sure what you mean by not thin or strong enough felt? Spotlight offers 1mm thin felt (self adhesive or non), and the felt doesn't need to be strong, as it is compressed, not stretched. Also, Bunnings sell rolls of 0.2mm self-adhesive felt for around $7, as well as 3mm thick self-adhesive felt in large pads (for automotive use) for about the same price.
Not sure velcro is a good idea even if on the "soft" side as it will still scratch the tube and does not compress like felt (felt adheres by compression, whereas the velcro weave, being plastic, won't and you may get slippage). Using thin felt, you shouldn't need mole grips or cramps to close rings. You are really risking damaging the tube - I'd really suggest getting the WO rings or the TS ones.
Lastly, using an f/7 guidescope on an f/2.2 imaging scope is far from ideal. You want the guidescope to be close in FL to the imaging scope - as is, your guidescope is more than double the FL of the imaging scope.
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