Could you then use an (HDR?) program that combines all exposures?
You get this already from Corona if you save in 32bit :- ) You can save with true linear (HL1, no contrast) and use any tonemapper on market for photography.
I do this trick as well OP, I just use CRX, but it's not bad idea at all and could be take further.
What you're asking for is to give "Beauty" pass also override tonemapping controls so you can bypass CRX.