I'm not that savy with the editor... and I'm sure if you were, with work you could do it there.
However, ShadowChemosh has the option to use his Gestalt characters. For those ten levels, you could be a Gestalt Kineticist and Cleric.
With adjustments, from the Community Pack, you could make it work well. For example, the Hero's challenge rating needs to be adjusted by -2 per gestalt level, since it will count Gestalt + Kineticist + Cleric as three levels, but that's one level in a Gestalt build.
Gestalt is an easy solution, based on tools readily available.
If you wanted to do this in the editor, I'd take a look at prestige classes in general and the parent classes too.
In general add the features of the less complicated class to a copy of the more complicated class.
If you required having all the class features of both classes, before you qualify for the prestige class, then it can advance them all.
If you can take levels in the prestige class, before one of the parent classes has a feature, that's a lot more complicated.