Square golpe symbol

I have been searching playing technique symbols for the little square typically used in flamenco transcriptions to indicate a golpe …
and couldn’t find it anywhere.
I managed here by using U+20DE from …

I couldn’t find the "Combining Diacritical Marks for Symbols in the list of Composites in the Edit playing techniques editor but managed to copy it and add it as text.
Was this the right way to do it?

That certainly seems like it would work, yes.

Thanks Daniel - I’ll make a note of this (to remember how in future!)