You could live in a WH with 3 characters if you are careful. I would suggest you also have a 4th character in a scanning ship that is never logged in unless you get the other 3 podded. That 4th could be an alt on one of your 3 accounts. As far as c4’s go you can easily set up some sort of spider tanking for the 3 accounts in a BS hull.
[Dominix, Dominix]
Omnidirectional Tracking Enhancer II
Omnidirectional Tracking Enhancer II
Omnidirectional Tracking Enhancer II
Drone Damage Amplifier II
Drone Damage Amplifier II
Drone Damage Amplifier II
Drone Damage Amplifier II
Drone Navigation Computer II
Drone Navigation Computer II
Multispectrum Shield Hardener II
Multispectrum Shield Hardener II
EM Shield Hardener II
Large Remote Capacitor Transmitter II
Large Remote Capacitor Transmitter II
Pithum A-Type Medium Remote Shield Booster
Pithum A-Type Medium Remote Shield Booster
Large Drone Scope Chip I
Large Drone Speed Augmentor I
Large Egress Port Maximizer I
Warrior II x9
Valkyrie II x8
Praetor II x10
That is the set up I used for c4 sites. 3 accounts. From what I recall all the remote repping keeps the sleepers attention off the drones.