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. Past bra strap length heading for waist.

CO-wash: Inecto coconut/ Elvive Volume Collagen
Treatments: Komaza Care Matani, coconut/ sweet almond/ fractionated coconut oils, Hairveda Sitrinillah
Leave in: Fructis Sleek & Shine (old), Gliss Ultimate Volume, various Elvive
Styler: Umberto Giannini jelly, Au Naturale styling gelee
Flour sack towel, pixie diffuse or air dry.
Experimenting with: benign neglect