Found a place pretty close by that could tig stainless couplers in my megapot and converted sanke...pretty cheap too: $20 for 2 welds. Dropped 'em off and went to get something to eat while the work was being done. Only problem is i neglected to specify that i wanted the couplers welded through the wall so i could reach the threads from both side; they just welded 'em to the outside.
Although i'll still be able to use them for a sightglass/thermometer (was more towards the bottom of the to do list) I was still a little disappointed in myself for not being specific...can't fashion a diptube if i can't get to the threads on the inside of the vessel.
Hopefully you won't make the same mistake