Maybe you can try this (run for android tablet but i suppose that was the same for iPAD :)

https://www.realvnc.com/ Free (the only one for me who simulate the Right Click and Mouse wheel )
if you need other than your fingers
- An OTG connector 3$ for connect your mouse on the tablett
- An universal stylet 3$

and you can use any progs running on your computer on your Ipad ! :)


Run like a charm for me on a low price Samsung tablett !
Of course you must have a computer in the near 20 meters...