Regearing Soon - New Locker Questions

TRDOR with the factory rear locker.
Currently have onboard air w/ Viair 450C (no tank as of now)

Going to 5.29's soon. Will be installing a front locker at the same time.
Debating whether to go air or electric. I'm aware of the pros/cons of both, but here's what's been stuck running through my brain.

1 - Add Front E-Locker, wire it to switchpros, done and done.

2 - Add Front Air Locker, add a tank, add solenoid, wire solenoid to switchpros, done.

3 - Add Front E-Locker, Replace Rear E-locker with a new E-locker, wire both to switchpros. Now I have rear locking available whenever I want (yes, there are reasons to want this feature outside of 4L)

4 - Add Front Air Locker, Replace rear locker with Air Locker, add solenoids, wire solenoids to switchpros. Also have rear locking available whenever I want.

I am in a fortunate position at the moment, and cost is not what I'm concerned about. While I'd never complain about saving $, having the rear locker available on demand is something I have use for.

Wondering if anyone has gone the route of option 3 or 4, and had any issues with the factory systems, or if anyone has gone air and wished they'd gone electronic, or the opposite.

Thanks for the flames in advance.