An off the shelf controller with several backup failsafes (they keep spares on board) is a perfectly reasonable way to do this. In such a cramped space, a hardwired or mounted helm would probably be continuously bumped or tangled.
Any custom purpose-built wireless device would just introduce more complication than necessary.
The navy uses it for periscopes, and training. Not piloting anything like this. This thing was definitely made as cheap as possible.
An off the shelf controller with several backup failsafes (they keep spares on board) is a perfectly reasonable way to do this. In such a cramped space, a hardwired or mounted helm would probably be continuously bumped or tangled.
Any custom purpose-built wireless device would just introduce more complication than necessary.