Will Bitcoin Core only show balances for UTXOs created after you`importdescriptors`? Or am I screwing this up somehow?
This will depend on the value of "timestamp" in 'importdescriptors'.In the example in the OP, he used "1647182091" which is the epoch date of "Sunday, March 13, 2022" so Bitcoin Core will only rescan blocks past that time.
If you want to rescan from the genesis block, set it to "0"; if you do not wish to rescan, set it to "now".
Thank you for sharing this! This is a better solution than my findings.