Hmm, now I wonder if Grant even makes a tilt/tele adapter?

Well, they make some for tilt columns, no mention of tele one way or the other.

1982-89 Tilt col. All Models 4324
1978-81 Tilt col. All Models 3196

Grant's website really sux for details.

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.