Is there a remote switch I can use to replace a switch located in a wall being removed?
That's possible, but I doubt that something like this would be up to any electrical code unless those are 3 way switches that have their counterparts somewhere else as they make wireless 3 way switches

Anyway, something like this seems like a bad idea. If you are remodeling anyway , then either fish the wires or open up the walls and patch them later. Nothing beats hardwired connection.