You should be fine, no worries! You'd definitely fit on all the simulators and the water rides. The Mummy will be fine. Rides that have the test seats will have them a little off to the side, and if you get nervous about it, have someone go with you and pose for a pic, or pretend you're taking a selfie while putting the harness on. RRR, Forbidden Journey, Mummy, Gringotts, Dragon Challenge all have them, and Hulk should have it back when it's online.
RRR, Mummy, and Gringotts hit the waist / stomach area for restraints while Forbidden Joirney, Dragon, & Hulk are over shoulder.
One thing I also learned is that there is a stationary platform on Forbidden Journey. Maybe a TM can confirm but I've been told it has the modified end seats; if so, and if you're worried or in the yellow/iffy area on the test seats, you could ask for it if it's available. Supposedly it gives you as much time as you would need to lock the harness so you're not rushed like the moving platform. Never tried it, but have been told about it by guest services.