Well in each individual dungeon you can make a setup for the positioning (the easy part
A setup for pausing(the hardest part imo)... you can hold the button then release it but i dont know of any way to make it release at a certain time without timing it on your own, but I can see this having a consistent method we havent realized yet, and it probably wont be done during a sidehop.
For the timing on the RI, I know Ben and myself find it very easy to bring up the home menu on the right frame, and you can buffer the input. If youre early on the home menu you can try to get to the right frame. I don't think anything else can be done to increase consistency here.
One other thing ive thought about, what if we used another method to delay the warp (OI?), then perfomred RI while you have control?