How to yield multiple requests but only action one request in Simpy

[BushChooks]

Within Simpy, I have multiple resources that can do the same job, but they are different so I can't just increase the capacity. Picture a single queue in a shopping centre that leads to all tellers. Some are manned and some are self serve. I put a request for both (two separate requests), and then yield rq_manned OR rq_selfserve, satisfied if atleast one of the requests is granted.

The problem is, what if they both become available at the same time, I don't want to actually request them both. What to do?