Been checking the egrip lately my self. The CL base should take the CLR head just as it takes the CL head? If that is true it will meet the second last check this one has to get. The last check is about the user friendliness of the CLR itself and judging by your experience it seems to do pretty well, since it's not flooding . What is your usual setup in terms of resistance used? Microcoil or standard coil? Also, for you, is there any change in flavour between the two rba heads?
I looked at some closeup views and a video on the CLR heads. The opening at the top is rather large. Seems it would need some kind of cap with o-ring to mate with the Egrip inner tube. Look at the tops of both the premade attys as well as the rba, these CLR's would need something like the setup on those to work, so it seems to me.