I think I currently use some form of this method. I'm low/medium porosity so moisture penetration is problematic for me. When in protective styles and I need to re-moisturize I first spray my hair (and scalp) with my water/leave in mix, oil my scalp, then seal my strands with a heavy oil (currently using Jamaican black castor oil).
Depending on how parch my hair, I may add a water-based moisturizer to my strands before I seal with JBCO. I finish off with a shower. The steam from the shower appears to wake up my scalp. I do this routine every 4 days until wash day. No itching, build up or tangling so far!
Side note: I used to add moisturizers and butters to both my scalp and hair. My scalp would have major build up in just a few days and itch like crazy. I switched to just water and oil for my scalp and it was a game changer.