Thank you everyone
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Twinkie actually scratched her head with her dodgy leg 2 days ago and seemed pleased with the results as she was off and running again when she'd done and didn't keep trying to scratch, so she obviously got the itch satisfactorily, haha. Which is a good sign! I've cut right down on the porridge/Ready Brek - if she has some it's a measured teaspoon full that I add milk to, but that's it.
Souffle, she does have what you suggested already in her cage oddly enough, all but an egg box. Sadly she does climb on top of her house but we can't take that away too as that's also her nest and it would upset her too much if we removed that as well I think, which wouldn't do her any good mentally - she's already confused at not having her wheel and limited time out and not climbing anything else.
But she's doing very well still, next check up is next week
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