We have three 'team centers.' Sounds like your 'pod' idea. Each one has a faculty doc, a resident in charge of just that unit, and a few interns and students. Rotating residents can take the place of, or reinforce, the EM resident in any team center. RNs and techs are scheduled to one team or another for a half- or a whole shift. (Note, this is a center with volume of like 80k/yr, so I don't know how well it would scale down.)
A = highest acuity (all beds have telemetry monitors). A cases tend to need more resources and monitoring, and A patients tend to be sicker.
B = lower acuity, plus Ortho, plus a Pelvic and a Procto room. A couple of the B rooms have monitors. One room has a door that shuts, and a monitor, and lots of floor space, so that's the procedure room. B cases are either really fast, or really labor-intensive (reductions, I&Ds, pelvics).
C = Peds and (to a lesser extent) Fast Track. C cases generally move faster, although there is a fair bit of waiting around for labs.
The resusc/ trauma/ burn bays are seperate, but the Team B R-3 = pit boss, with faculty oversight in the room. Team A's R-3 will take the second case, if there is one. Team C's takes the third, if there is one. R-2s do airways, central lines, etc, with R-1 backup. DRE tends to be a R-1 thing.
To prevent unfair distribution of workload, the Charge RN and Team A faculty decide what changes, if any, to make based on volume. And since all residents rotate from team to team, it all works out.
The key difference between this "pod" thing and your present system is that because it's divided up by team, each R-3 has specific duties, and R-3s never compete with one another for the same cases. There's no way to slack; if your area is covered and the other guy's is swamped, then the next heavy rock will go into YOUR wheelbarrow.