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Do you mean using 22.2->25.4 and then 25.4->31.8?
I would imagine that slippage between the shims would be your biggest worry. You should be able to find the right spacers with some careful searching. Found quite a few options on ebay and aliexpress. Problem Solvers make them too although SJS don't seem to have them listed.
My Surly Sunrise bars are 22.2 and came with spacers to fit 31.8 bars. They are a thing. You can get them.