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R, RStudio: programmatically switch between 32-bit and 64-bit versions of R

Is there a function that in RStudio restarts the R console in 64-bit mode or 32-bit mode without re-opening RStudio (or at least automatically reopens it if this is not avoided)?

I usually run in 32-bit when using RODBC so that I can retrieve data from the Access database, but would like to use the 64-bit mode features for all other tasks while still in RStudio.

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