The good news is that I was able to hack the wallet json file to remove an entry and re-import it... successfully!
The bad news is that I have no idea whether the thing I removed was bad to remove. I don't appear to have lost funds (after re-scanning).
I removed this:
{
"type": "key_record_type",
"data": {
"index": 11,
"account_address": "BTSX[...]",
"public_key": "BTSX1111111111[...]",
"encrypted_private_key": "[...]",
"memo": null
}
},
If the exact data is important, please let me know and I'll pass it along in a less public way.