TPS - stripped screws in impossible location

Need to replace throttle position sensor, however the mounting screws are stripped (believe the proper screws should be t20 torx, however what I have inherited seem to be busted up flat screwdriver). Have seen several ideas including notching screws with dremel, or grinding them off at the head. This model car has basically zero room for any of that (i can barely get a pair of needle nose pliers in this space, and that's not enough 'grip' to turn them). Removing the throttle body might give me a little more room to work around, but I am not convinced it will matter as other rigid parts of the engine make the area very difficult/tight to work in. Does anyone have any bright ideas I have not considered?