Yes, but if you want to go in that direction, then it doesn’t make sense to simplify it only for low-value UTXOs. If you assume, that reorgs cannot be deeper than N blocks, then you can simplify “txid:vout” for all UTXOs with more than N confirmations. And then, when you send transaction data, you can have the current format, where “txid:vout” is used, and some new, compressed format, used between new nodes, which would send everything in more packed way.
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