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I thought you could get around this by removing one of the sprockets from the 11sp cassette so that you would preserve the 11sp spacing but you’d just be missing a gear?
I just tried this and fitted it to the 10sp freehub without the spacer and I was at least able to tighten the locknut. I won’t have time to test ride before my turbo session tonight but I guess I just have to remember to avoid the 11t (don’t worry I’m not that strong anyway!).
Mtb (or ground down 11sp cassette) isn’t an option in this case because I want it sorted for tonight and hopefully it’ll only be for a few rides until I get my tt bike rebuilt.
presumably the turbo with the 10sp cassette on it will also have a spacer.
Remove the spacer and put a 11sp cassette on without a spacer. That should be all.