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@M_V
Do they work? Yes.
could they be used a temporary Solution? Yes, some manufacturers spec them as a permanent solution. Orange P7 I had came with a factory fitted (maybe glued in? I can’t remember) shim to take the obscure seattube id down to 27.2.
Should you use one in order to use your Thomson post? Given that I’ve got personal experience of a couple of Thomson posts and have heard/read of numerous more examples of specifically the 27.2mm posts being undersized then I’d say a better way to go would be to take what you would spend on a decent shim and buy a cheap post in the correct size.