Agree with Kathymack about the difference between overconditioning and simple product overload, also agree with Lynae that a thorough water rinse or co-wash should get any excess water soluble products out. I don't believe my porous hair has ever been overconditioned, but it has had product overload and I've never needed shampoo to correct that unless I have used silicones.
Also would ask why you want to 'open' the cuticle anyway? Most ingredients in conditioners adsorb to the surface of the hair, they don't absorb into the shaft itself. Small fatty acids such as lauric acid from coconut oil can penetrate dry hair with a 'closed' cuticle, there is a school of thought that says they penetrate dry hair better since oil and water doesn't mix.
2a-2c, medium texture, porous/ colour treated. Three years CG, growing out mechanical and chemical damage = breakage and very high porosity. Past armpit length heading for waist.
Treatments: Komaza protein, Komaza Matani, coconut oil with sugar syrup. Hairveda Sitrinillah
Leave in: Fructis Sleek & Shine (old), Gliss ultimate volume
Styler: Umberto Giannini jelly, Boots curl creme, Rockin RInglets
Experimenting with: Mega-Tek, Curl Harmony reviver, Elvive Full Restore 5.