There's nothing like that, really. The only remotes I know of are for musicians. To remotely control the iPad (other than that) is pretty much a non-starter, unless you use a Bluetooth keyboard. But, it doesn't let you switch between apps (and, AFAIK, nothing does).
Apple is pretty strict with security, so controlling the iPad remotely as a whole, versus within one or two apps, is a no-go. Sorry.
Marilyn