I agree with others who suggested in essence that anyone serious enough to be using Subversion will have the BBEdit's command tools installed.
I use Subversion seriously, but don't use BBEdit as my primary editor, and don't recall whether I have the tools installed or not. You're welcome to love BBEdit, but assuming that everyone else thinks it's "the bee's knees" in a way that could cause problems if the tools aren't installed isn't wise. There may certainly be a better solution than the current one, but assuming use of a third-party commercial product doesn't seem like it.
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