i think u are raising too many points here ( if i got this right)
i would stick to " proposals - suggestions/ advice board" for now
we discuss this before that eventually the proposal load will get too much for MN owners to stay on track
we discuss before (is tht why u are talking about) an "advisory board" to mn owners - maybe selected / voted from community who give short / sweet/ fact advice about proposals and a yes/no or even %
i believe this would really help to secure good proposals do not get lost - bad proposals to be filtered out - and keeping MN owners on track with ongoing proposals (downvoted or let run)
MN engagement is key for the budget system to work and the easier and clearer we make this to MNO the more they will vote and engage
(hope i did not derail your thread here

)