ACN has actions unavailable to SCH, so CNJ can absolutely also have actions unavailable to WHM.

It’s a change that could literally be done in minutes. With the job stone, you are WHM, and you have an appropriate DPS rotation. With CNJ, the literal only thing that changes is anytime a DPS action is gained on WHM, CNJ instead has a trait that increases the damage potency of their Glare/Holy/Misery.

The only thing that would require investment is reworking WHM, but the following CNJ changes are seconds of effectively copying data over. That way you have your button mashing healer and an alternative for anyone that likes WHM but wants to engage with the combat model.