Yes, you can use the Kick w/ an 18650 in the GGTS, but you will end up with some of the threads exposed on the telescope tube. I don't like the look of it that way, but you can do it.
Kick + 18650 + UFS is WAY too long of a GGTS setup for me. The Kick + 18490 + Full Mode Ody is nearly too...