Since you have a state license, I caution you about getting into wholesaling, you could lose your insurance license from illegal real estate activities!

I'm a licensed REALTOR in Michigan (solely for my own investing), which makes access to the property and to information as efficient as possible. 

She is interested in becoming a licensed agent, but does not want to jump in with both feet yet, and wants to see if this is something she is good at, while holding her job. 

I've seen many debates on here about the advantage/neutral/disadvantage of having a RE license. 

The only way it is illegal, is if you are selling Real Estate without a license.... if you are simply assigning a contract for a wholesale (matchmaking for a motivated seller and buyer), you are not selling, so it should not be illegal to practice in that state or any other state.  

I may profit by rehabbing because I (a) am a licensed GC (b) own a full retail renovation company that creates a volume i can (c) leverage with manufacturers for direct supply and volume discounting and by which (d) I have the full management and operational team at my disposal to perform on my properties at cost.

You will need an OK licensed attorney to handle all the Oklahoma legal matters.  

I understand that I would have to work under some real estate companies for 2 years before I can get the real estate license (besides 60 hours of classroom).

or one drafted by a state licensed attorney? 

I'm in the process of obtaining my real state license.