Valve Cover sealing problem with a stripped out bolt hole

Take it to a shop that has a tig welder and someone that knows how to use it. If you were closer my son would have that out in minutes with his fingers. Fill the hole and add on the bolt with weld. Then weld a nut on. Cool it quickly with air a turn it out with your fingers most of the time. If not he grabs them with a pliers. Every other day there is someone here with a broken exhaust bolt that they can't get to. There has not been one he hasn't gotten out in the car or truck.