You are going to be extremely limited as most RDA's are 22mm. In addition, your spinner battery has an amp limit of ~ 2-2.5A so you will not be able to build any lower that ~1.8 ohms (which is most likely the ohm of the coils you are using in your current clearomizer.
Hopefully someone will know of some smaller sized RDA's. I think there is a mini Fogger and maybe a mini Kayfun. You may up paying as much for these as you would to upgrade your battery (and the airflow isn't going to be great).
If you were to upgrade your battery to something like an iStick 30watt then the doors start opening as far as rebuildables.