This clears up.
I suppose a BTS account can claim from multiple owned ex-keyid accounts?
you will need to import private keys that held funds during snapshot into a regular account .. as it was done in BTSX originally .. nothing special
you will probably need to import all your *account* keys as *account* keys in BTS as well to redeem the funds .. importing as it was done in PTS will not work due to TITAN.
1) export you account priv key from DNS with "wallet_dump_private_keys accountname"
2) import into BTS while also creating a temporary local account:
wallet_import_private_key KEY localaccontnameFoobar true
The latter "true" is important here as it creates a new local account with with the corresponding private/pub key as ACCOUNT key! Thus allowing access to TITAN funds
Maybe the devs come up with something much simpler as "importing the DNS backup file" ... or so