[Xandru]

–DV tape can only record DV signals

Actually, I think that’s not strictly true.
I recall this little utility that allowed you to make data backups on DV tapes. That was over FW, of course, not SDI, but it makes me think the deck really don’t care about the data it’s writting on the tape.
I haven’t tried it, not even remember it’s name, so please forgive me if I’m incorrect.

Xandru