You wrote:
I had written:It seems unnecessary to use "will" for both θελημα and βουλη. Why not say God's plan (βουλη) includes everything that takes place. Some of it aligns with God's will (θελημα) and some doesn't?
It seems to me that "plan" would also be confusing. No doubt God has plans for this life and world that are hidden from us,while on the other had Christian's speak of God's "plan of salvation" which has been revealed to us. What would you call God's plan(s) that He is determined to bring about that are hidden from us?Determined or sovereign will which generally can not be known to us.
I don't see why having more than one will is a problem. When I was young my determined will was to complete my education but my desired will was to go fishing.
Definition of WILL
transitive verb: desire, wish <call it what you will>
1 —used to express desire, choice, willingness, consent, or in negative constructions refusal <no one would take the job> <if we will all do our best> <will you please stop that racket>
2 —used to express frequent, customary, or habitual action or natural tendency or disposition <will get angry over nothing> <will work one day and loaf the next>
3 —used to express futurity <tomorrow morning I will wake up in this first-class hotel suite — Tennessee Williams>
4 —used to express capability or sufficiency <the back seat will hold three passengers>
5 —used to express probability and often equivalent to the simple verb <that will be the babysitter>
6 a —used to express determination, insistence, persistence, or willfulness <I have made up my mind to go and go I will>
b —used to express inevitability <accidents will happen>
7 —used to express a command, exhortation, or injunction <you will do as I say, at once>