Simple question, can I install the +123 2.2 mod ontop of the Conversion Pack 2.0, or will it conflict?

Let's put it this way: you can install the +123 mod over the Conversion Pack but they will conflict. Both mods add Yavin 4: Arena, Rhen Var: Citadel, Rhen Var: Harbor, and Bespin: Cloud City to the Instant Action list and a number modes to the stock maps that may be the same.

Well the only thing that I am really interested in from the +123 mod is the ability to play Clone Wars on Hoth and GCW on Geonosis.

Almost all the scripts to the +123 mod were released with +123 assets (check the Assets Links Thread). You can find the CW Hoth scripts and GCW Geonosis scripts in the +123 assets and use those to munge your own "map" that would add those missions/modes to the stock Hoth and Geonosis.

Yes it works (for me atleast). The rhen var maps and bespin maps are not called "rhen var: harbour and rhen var: citadel. They are just called "Bespin, rhen var, rhen var. Oh yeah, you can also edit the names your self.

PS. Do Death star- hero assault- clone wars. You can play as the dark trooper phase 3. Hes a giant dark trooper thats so powerful with awesome weapons and anims.