Pondweed, I've had a play, and I recall now I bought a cheap set of torx bits from the local motorist centre, they were a few mms longer than my set, and just reached. Can't offer to send you the right one at the moment as my son-in-law has borrowed them ( can't moan, I used to do it all the time to my Dad).
Howver, I note that a 4mm Allen key is a reasonable fit, if a little loose in the 6 sided Torx, so you might get away with this. Try it on the new wheel, you can judge whether you think it would work.
Malcolm
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