Ok so I ordered the socket and the new high port valve (no Schrader valve btw). I put a 5/8 wrench on the bottom and using the special socket I can't get the valve to loosen. I didn't put a lot of pressure because, like the original poster, I feel like the aluminum tube is going to bend.

I sprayed with PB blaster and will try later. Any issue you guys can see if I use a torch to heat up the valve?

Thanks