This all seems like rather a lot of hoops to jump through. Why not simply do:
:0
* ! REM ?? "Here's a log entry for a recipe that does nothing interesting"
* foo
{ }
As long as REM has not somehow become set to that same string, this
has no effect on the rest of the recipe. If you're really paranoid
that this could somehow come to pass, then what about:
:0
* 0^0 "Here's another log entry for a recipe that does nothing interesting"
* foo
{ }
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