You can peg-in to Liquid with Elements Core or https://sideswap.io/peg-in-out/, than swap back into BTC at boltz.exchange or swapmarket.github.io. This will give you new UTXOs with no link to old ones.
not clear what do you want to do.
You want to sweep old UTXO in new ones or what? That you can do it easily without any intermediary, with Electrum or Sparrow, even batching txs.