Problem with removal of expansion valve on 92 300E. I removed one of the 3mm hex head bolts but could not remove the other, it's stripped.

I removed the all plastic stuff around and over it to get good acess, but I'm not sure how to proceed.

My options seem to be:
1-try to remove the stripped bolt with an easy out, I do have room I think with a right angle drill,

2-drill the head of the bolt off and slide the expansion valve off, but I'll still have the problem of removing the bolt.

Question:
If I drilled off the head and slide the expansion valve off would the plate that the bolt goes into slide off too or is it behind piping that is flared.

Any suggestion would be most appreciated.

A photo of the valve is below.