Move Diverter Valve from Handle to Spout

My current single handle tub/shower faucet has the diverter located below the handle, through the back plate.

The new trim kit I'd like to buy has the diverter in the spout.

Can I set the diverter position to the tub, remove the existing knob and plug the hole with a brass threaded plug?

There must be a way to get around this without replacing the whole valve assembly.

Thanks in advance.

Deb