Self resetting remap suggestion

I'd like to set up a "temporary" remap in a plugin on the working buffer, i.e.:
* assign a mapping
* then immediately remap to the prior mapping (stored prior via a call to mapcheck() ).
The mapping would fire, then re-assign itself to the prior mapping.

This ends up being tricky, as the syntax of a remap makes it hard to add a remap. As an example, presumably I have to use execute in the remap (to get the variable which holds the prior variable) but it's not at all clear to me how I'm supposed to escape everything to get it to work.

The best approach I can find is to map to a function call. Has anyone else done this? Any suggestions about the best approach?

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