I had a similar thought the other day. A set of rigs that would expand the drone bay and bandwidth would make for some interesting options.
T1/T2 Drone Bay Expander provides 5/10m3 worth of drone bay respectively.
T1/T2 Drone Bandwidth Expander provides 5/10ms worth of bandwidth respectively.
The limit of 5 drones still applies per the skill level. So you could put 4 heavies in a Vexor if you wanted, or 5 in a Myrm, but an Ishtar won’t benefit with the exception of the Drone Bay Expander. A ship with no drones could have a nominal 15m3/10ms worth of drones, all at the cost of valuable lost rig space.
It would also be nice to see a small buff on the EWAR drones. Just enough to make them useable. They don’t get much use as is.
Edit: Maybe to build on the OP, one of the rig downsides could include lost cargo hold space as it was converted to a drone bay. And increased signature because of the bandwidth output.