Yes, J Rhodes is a good place to start.  Every component has a purpose.  The peas are high crude protein, balanced heavily towards lysine.  Soy is high crude protein, heavily balanced towards methionine.
The two most critical amino acids?  Yup, Lysine and Methionine.
Sourcing ingredients for J Rhodes's recipe can be challenging.  I can't do it locally - no availability for winter peas here, either.  Can you get field peas (i.e. black eyed peas, purple hull peas, cowpeas, etc?)  I can sometimes get those, but I'm "down South"...