R help - Jan 2015 - Do any R-packages include a function for "reverse" radiocarbon calibration of calendar dates?

I need a function that "reverse" calibrates radiocarbon dates (similar
to
the R_Simulate command in Oxcal). In essence, the user inputs a calendar
date and the function outputs a possible radiocarbon date based on the
probability distribution at that point on the radiocarbon calibration
curve.

I have checked through the Bchron package and can't find a function that
does this--perhaps I overlooked something? Or perhaps there is another
package with R_Simulate capability?

Thanks!
-Brigid

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