Hey Joe (or, since I don't know ya, Mr. Hubbard),
I've trained KM and switched to CKM a year+ ago. Love it. My good buddy is a Level 3 instructor under Moni. I am unaware of there being any contract that says one cannot train elsewhere. We actually crosstrain/teache with our old KM instructor, who left Levine's organization due to the ridiculous fees (and because he's open-minded).
What has been discussed, however, is the caution in overly mixing two "reality based" systems that are not close enough alike, due to potential confusion. Combatives are combatives, but various "styles" have their preferred ways for dealing with scenarios (duh.). My buddy was encouraged to go ahead and crosstrain some ground fighting, Judo, and with Mr. Avi Nardia, who teaches Kapap here in the States. He also trains in some Filipino and Indonesian stick/knife stuff, which has not been a problem with Moni.
That's all I know.
Wizard