Any way to do such a thing?
I've got a cohort that is Tinker Alchemist 1 Iron Priest 4. I wanted to go holy vindicator with them but I don't know how to make it work with range.
Right now they are good at picking off weak enemies with their bow and keeps our constructs ticking. We have a good GM that mixes low CR [fey goblins and mites] with high CR so our cohorts have something to do other than buff.
Maybe not 'Channel Smite' but you can turn your channel energy into a ranged weapon. Channel Ray. Combine it with the Conductive magic weapon property (and the Sacred or similar enchant) and you can launch a blast of channeled energy along with a ranged attack.