I think everyone is actually missing something here. Let me go grab a quote from the first part of Project Protector:
Specifically, in the original post introducing us to Project Protector, there is zero mention of the brig (In the specific specifications of the contest). Now, there's an argument that we need a brig, and one that we don't. I actually, to a point, don't think we need a dedicated brig, though realistically it should be included because, well, it's a police/CG cutter. Let me explain through the use of another quote from the QM.
So, essentially, the QM has all but flat out stated that taking all 5 options is going to be actively detrimental to us. What we need, as stated by the QM, is Design Synergy. Thus, we have to break down the five options into things that have exceptional synergy... or do the thing both do better than the other does.
With that in mind, honestly, my thought is that we just... do what the Telleries and the Denobulans did better than either of them did... which we do simply via virtue of a single nacelle Type 3 for the latter, and by including the correct utilities, to an extent we do for the former. Thus, I would propose that we take a Brig, Tractor Beam, Cargo Bay, and, if we absolutely must, a fourth choice, which should realistically simply be the Transporter.
I'm not really proposing a plan since if I recall correctly it's already been proposed, and thus would be redundant to propose again.