Been thinking about this. Its possible I was thinking of security possibilities over utility, and my own peace of mind over ease of use for people.
So, Im gonna stick with one hangar + cans for storage and some use, but change things up slightly.
All BPO's that we have in MAADI - a number I hope to increase over time as KASEI sitting with BPO's doing not much (especially if we already have lots of copies of said BPO) isnt a good thing - will be removed from cans and locked down in the BP hangar. That way they can be used by people we trust not to fuck us over, and still maintain my peace of mind in that nothing goes walkies without my say so (major shareholder who is active>all as U'K shouldve known!!!).
Majority of copies can be kept in cans in that hangar. However, say 3 of each type of copy (noncap bp's - all of those will be moved to a new lowsec station and left in then main bp hangar) can be dumped in the second hangar and used by anyone who can build (we can two tier building thanks to the way hangar permissions work). As those copies in the that hangar run out, open cans and replace.
So not much management = 5mins of work for me (since by the time this goes live, i'll have 2 alts living in kasrasi anyways), and I still get my security.
tl:dr
Kasrasi hangar 1: bpos out in the open under lockdown votes; BPC's in cans. Trusted builders able to access this hangar.
Kasrasi hangar 2: 3 of each type of bpc sitting out in the open (ammo, ship, drone basically) for anyone with correct privileges to use.
Lowsec Derelik office hangar 1. Cap parts bpc's and cap ship bpc's sitting and useable by trusted cap builders.
Not a return to 2 hangars by bp class, but a compromise.