From what I have seen Pogonomyrmex can be somewhat challenging to get through the founding process since they do not seem to do the best in test tubes.
If you are only going after a handful of queens and don't mind watering once a week or so, you can try making nests with just one-two chambers. The nest can be made out of firebrick (K-23 refractory brick), grout, ytong, etc. Or you can buy some of the smaller formicariums designed for founding queens (I am sure some here will list some).
I have seen some people use plain agar food gel in 1/3 of their test tube to make up for substrate. http://www.formicult...et-ups/?hl=agar
In this link are several ways to make formicariums - admittedly they are meant for larger colonies, but you can downsize them to just 1-2 chambers. Look in the Tutorial Section.
http://www.formicult...of-handy-links/