I haven't done much research into the specific exploit games and their savedata (I have only known the method to overlay TN-V11 onto any PSP game via mail exploit), but I do know that Numblast is one of the smallest PSP games you can purchase for the Vita size-wise, and is by far the best PSP game to use as a basegame for TN-V11. I would recommend following the tutorial to overlay TN-V11 over Numblast, as you can boot TN-V11 straight from the Vita home screen without having to constantly enter Numblast and trigger the exploit to boot into it. The TN-V11 overlay is also permanent, which also means it can also survive things like a database rebuild.