I would not play with fire…
Tor onion address is also linked to your LN node ID so you will have fucked up anyway all the peers and channels.
If you have a compromised onion address, I would go for a full reset and create a new nodeID/wallet/seed/onion etc.
Follow the instructions from the guide to recover funds using option 3 with Blixt, meanwhile you are building a new nodeID.
There’s no need to wipe all data, just reset user data (see troubleshooting manual about hos to reset user data).
Once you have the funds from previous node recovered in blixt, you can move them to your new Umbrel node or just use Blixt as a companion node to your Umbrel.