but unless you constantly want to switch saves to access homebrew (which is only an option if you do have powersave), you really dont get around wasting a copy of oot. since the last update, the hack also takes all 6 savestates, before you'd still get like one save left to play with.
all in all, save up some money, buy a second oot. or save some more and get cubic ninja
Also, If you own a cart and have access to homebrew on another console (or have a friend that does), you can use that said console to set OoTHax on your cart so that it works on your other one.
As @Clydefrosch said, it's a pain to switch saves all the time and it's only possible if you own a powersave. You'd better back it up (in case you found another entrypoint) then say goodbye for good to your playthrough.
I don't know of this one, do you still have the link to the video ?
There is Ironfall : Invasion (IronHax) that works the same way but it requires older versions that aren't downloadable anymore since it has been patched in the newest one. That means Nintendo knows how to patch this kind of entrypoint, so though ther may be other games that allow it it's not likely that another one is released.
Also i think i wouldn't get my hand on Cubic Ninja. That game have got more expensive when the exploit came and also it's more likely that i won't find it any local stores. Worst part is that Ninjhax is the only stand alone exploit to access homebrew :/