Ok, As for the first part, There is no other way to do this unless you buy the game. 3.52 and lower you could set up both bubbles then update to 3.55.
As far as the 2nd part goes only half of that will work, The installed ark will work on the lower firmware ps vita/ps tv, but restoring it to a 3.55 ps vita will not do anything. Too many exploits were fixed in 3.55 for that to work. I doubt you would want to do this but if you get another ps vita on a low firmware, you can set up both ark and tn-v, then update to 3.55 so you can have both bubbles that way.
Sorry for taking up so much of your time with this, was just trying to figure out the best way to go about the situation. I am glad that you have the better of the 2 set up on your 3.55 vita at least with tn-v11.