[ms office - 2016] Can I lock the original but allow changes to a copy of a Word 2016/365 file?

[LeMarchand]

AO would like to put up a "Supply Teacher Request Form" on O365, the idea being that staff could fill it in and then send it to/share it with her whilst still keeping a record of the request. Obviously someone will inevitably make changes to the original, requiring a re-upload or the next person will clear the preceding details thus losing them so we'd like a "master copy" that is inviolate but can be edited when copied elsewhere.

 

I've tried sharing with the edit box unchecked (doesn't seem to respect it), marking it read-only via properties (ditto) and marking it read-only via "Restrict Editing" (works, but stays in place for subsequent copies). The only thing that at least partially works is marking it as "Final", which at least flags up a warning - but this can be dismissed.

 

Anyone know a better way to do this?