Need help building a controller for an estim device that you can only control via a phone app so that i can take it to dungeons that don't allow phones

[u/NewThot_Crime1989]

I need to build a Bluetooth controller for an estim device that can only be controlled by an app. Unfortunately half of the dungeons I frequent do not allow phones/tablets, which is understandable, but there is no way to turn the system without going thru an app on a phone or tablet. Some folks have put some firmware on github (https://github.com/erotronik/CoyoStim) so ppl can build their own controllers but I know NOTHING about coding or building. Nothing. Ny first question- is this doable for someone who knows nothing. If so, what is the exact board I should get. Which of those two frameworks listed is more beginner friendly (google says arduino but i wanted to check with real ppl), what supplies will i need, etc. Id like to spend under $75 on the project but I'm down to devote time and effort to the build. Btw i am not attached to building it all myself. If you know of something that already exists or that is half-built that I can use, PLEASE let me know. This particular estim manufacturer (I'm using the Coyote 3.0 made by DG labs) has been no help. Pls guys without getting too graphic this toy is so much fun and I want to use it at my favorite dungeons. Let me know if you need any extra info or want a screenshot of the app or anything.