If a wallet is unaware of spends of its own coins (ie, transactions were made it can't have known about), there's probably bigger problems going on. You might enjoy the topic on this mailing list on committed bloom filters however, as this solves a similar issue without needing an ever-growing list of hundreds of millions of spent outputs.
On 2017-04-02 06:04, praxeology_guy via bitcoin-dev wrote:
Bitcoin nodes could also keep a spentness status list, where each bit in the spentness status list corresponds to whether a txo in the MMR is spent. This could make it so that disconnected wallets didn't have to guess the pruned relative spentness status when it reconnects to the network... and help prevent DoS attacks.
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