Hello
SRT needs a good anchor at the base of the tree, wich is not easyer to install than a DdRT system.
Hicth climber pulley, a good friction rope, foot blocker + HAAS, New Tribe Aero saddle and of course a good arborist rope like a Poison Ivy, that's to me a great combo. But clearly as you'll climb once and then stand for hours so i don't think that you really need an HAAS or even a foot ascender. Take a hand ascender or a basic ascender, put two webbings under it and there you go, you got a 2 feet ascender. Simple and effective.
But having the right gear wont make you practice the right climb. Friction hitches can be done in various ways, some will feat your needs (depending on your ropes and weight) some wont. So getting to a tree climbing club to enjoy a course would be a great help for your ease of practice and above all your safety.