I'm in a bit late in this discussion, but up to the last series I shot on 24fps film, we ran 30fps TC and 24bit 48K. The lab took care of all the rest. Since workflow is so different now (that was about 2012, or 2013), that may not be the right way to do it now...so no help really, just a bit of history.
Please let us know how it all works out, Jon G.