Sorry for the late reply Dan, the notification ended up in my spam folder.
Thanks for the info, but I’m not quite getting the result I was hoping for.
I think that the solution might be to try and link the Source Text property to the 2nd value of the Rotation Property, but to ignore the “1x” value and the “-” value.
For example…

…ignore “0x” and ignore “–” to give 15°.

…ignore “0x” and ignore “–” to give 359°.

…ignore “-1x” to give 0°.

…ignore “-1x” to give 30°.
Does that make more sense?
Would that be possible?
The wiggle was used just to test it out. I’ll probably be keyframing these values manually but with a bit of wiggle added.
Many thanks.