Someone familiar with tractor 3 point "in general?"

You have to think about the backhoe itself, will likely lift the back of the tractor given the oppurtunity, but the majority of the abuse will be handled by the outriggers and the top link.
You could fabricate a bracket in place of the top link as there is no concern of lifting or lowering as there is no actual functioning 3 point hitch. Those 3 point hoes arent known for their power,but sure beats digging a hole with a shovel.