Since you are testing the waters why not use the equipment available? I don't know what arrangements that studio has but it can be rather time consuming to make pt/pd prints so if your time allowed with the vacuum uv box is restricted that could be a problem. I have never used a vacuum box. I use a printing frame with no problems. Actually when I started pt/pd printing I bought a starter kit from Bostick and Sullivan and used the sun as a light source which in itself had limitations but I'm in sunny south Florida. Once I was sure I wanted to continue with that medium I bought a UV light box and a larger printing frame. I see no difference in the prints exposed with the sun and those with the light box. Using the light box is much more convenient --- print any time of day in any weather in the ac and no mosquitoes.
Enjoy, there is nothing like a pt/pd print.