I've removed the microwave and after inspection and advice from a carpenter friend, it looks like the best solution is to build a new support platform. That means the range hood will have to be removed, not a big deal with 4 screws and unplug electrical connections. The biggest problem will be establishing a plane of reference to work from. Of course, if I ever have to replace this oven I'll probably get to do the job all over but at least I'll have this experience to help guide me.
Thanks for the input. I'll try to post my final solution.
Pete - Full Timing
2000 Country Coach Magna 40', CAT C10, #5892
2006 Jeep Liberty