I'm familiar with he Turnigy switch as you know, the OrangRX one is new to me.
I don't think it takes it's load from the receiver, certainly not a 2A.
I think it might switch a separate supply like the Turnigy and the polarity signs on the board are misleading?
Do a test circuit with it on it's own with a RX, separate load battery and load to check the operation.
The supplied documentation isn't very clear either.
Doug might chip in and confirm my thoughts🤔
I attach my rough circuit to show how I connected mine, remember that the RX neg and switched load neg have to be commoned for the Turnigy switch to operate correctly.
It's must be a pain that HK are out of stock, using all of the same switches would be so much simpler.