I've done a 4" center faucet into one hole unit. I used PVC decking shaped to cover the old mounting holes. Then I drilled and installed the new faucet as usual. Everything was sealed with white Dynaflex. You could also look into faucet hole covers.
https://www.amazon.com/18275-DYNAFLE...language=en_US
https://www.amazon.com/AiHom-Bathroo...language=en_US
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This is my signature line. There are many like it but this one is mine.
What a pain in the transom.
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