You can use Worship Beats without Sunday Keys but it would take a lot of work to set up, and we wouldn't recommend attempting that. We have designed Worship Beats to work with our Sunday Keys for MainStage template.
Remapping Worship Beats would be quite an undertaking. You would need to set up all the buttons/knobs/faders/text boxes in the Layout mode, and then write down all of the mappings for each button, knob, and fader (because MainStage causes odd glitches to the concert file if multiple instance are open at one time). You would then need to make every mapping as well in the Edit mode and also add text to the buttons/faders/knobs.