Best way is to make a new timeline with only those shots, grade them and then send em back for him to reapply Twixtor.
Or export em using commercial workflow.
Request nr 35435348 for OFX plugins in Resolve :)
A slice of color...
DaVinci 8.2.1 OSX 10.7.2
MacPro 5.1 2x2,4 24GB
RAID0 8TB
GTX 470 / Quadro 4000
Extreme 3D+
ICA Instructor
http://www.icolorist.com/Sascha.html