Why not use the Slider on the HOTAS throttle to engage the reverse thrust?
When I use my X56, I bound the HOLD REVERSE THRUST command to the Slider On Press.
So when I land, I pull back the throttle to IDLE, touchdown. use the slider to engage the reverse thrust. Then I push the throttle forward to increase the reverse thrust power.
Once I’m done, I pull back the throttle to IDLE, use the slider to disengage the reverse thrust, then I would be on forward thrust again.