We have several switches and crossovers on grades, even a reverse loop track on a grade. It is steeper than our other grades, but it don't get used often, and it very short.
If you look at our layout, the track plan is very similiar with your 2 loops. The upper bridge on our layout is only there to create the reverse loop for the outside track. When I was designing the track plan, it was very important to me to be able to reverse directions on all the loops. I didn't want to get stuck running a train in only one direction.
On your track plan, I would suggest adding another set of crossovers before and after your reverse loop, from the outside track to the inside track, that way you can reverse direction on either loop. You also need a reverse loop on the left hand side because now you have no way to reverse back to the other direction. Your current configuration leaves you stuck running in one direction once you use that reverse loop that you just put in.
