I am working on a concept for a Spheres of Power character. My end goal is to get the psudo-Eidolon to a sphere caster level of 10 so that it can take the feat circle casting. If I can do this then this allows me to turn these summons into useful healers and have them concentrate on whatever I want cast so I can be doing other things (and hopefully saving my spell pool).
I can get them access to sphere casting with the feat basic magical training. This gives them 1 CL and access to a sphere. But I cant find any way of increasing their CL except with expensive magic items like orange ioun stones.
There are two 3pp feats which would do the job, except that the DM does not want to bring in 3pp stuff if it can be avoided. This is to prevent cherry picking, which is why full rule books are allowed but not others. There is improved caster level and intuitive spellcaster.
I considered giving them a spell like ability, but I havent found a method of doing so and I am not sure if that kind of racial HD caster level would work for the purposes of taking the feat circle casting.
So, does anyone know of a possible method of doing this using core, path of war, and/or spheres of power?