On "Choice:"
The PHRASE WILL be: Per Electum . . .
(I look it ALSO through the idea of "by election . . ." which has a WHOLE different set of connotations, ESP. in religious circumstances.
The LATIN means BOTH. It means that we ELECT (Choose) to be here.


By "blood" refers to EACH OTHER (not really our connection to Scotland, which may or may not be by blood).

The Overall meaning is that we are a "clan" united by our DECISION to be here, not by our BLOODTIES to ONE ANOTHER. In other words, we are an ENTIRELY volunteer "clan."

So, the FULL LATIN slogan is fine.
The shortened version: "Per Electum" (By Choice) would ALSO work for me.