I would like to avoid an access hatch if at all possible. Could possibly move the left crossover to the left until it becomes reachable. The other crossover could be moved towards the right as far as the Bridge?
Here's an alternate design where I believe there's sufficient access to the switches. Note that I replaced the 11° switches with O72 switches located on the curves for a smooth transition. I also moved the rightmost tracks in a bit to get them away from the edge and give the lift-up bridge structure more room. When you get to planning for the bridge, take a look at this thread of Mike G's, especially the 2nd video of the bridge in operation.
I placed a yellow access hatch just for information to show where it might go. What you do is place some landscaping on it and make it removable. That way it's there if you ever need it. Many modelers place they accessories on removable platforms whether they be access hatches or not. It's a lot easier to work on animated accessories if they can be moved to a workbench for repair.