Toeing out the speakers seems like good advice.
Dynamat makes some good material that you can purchase in sheets. Just slice out what you need with a carton knife, remove the backing and stick them on. Literally takes 10 minutes per driver.
The Klipsch drivers are held in with machine screws. So, they can be removed and retightened with zero risk of damaging the cabinet or the fasteners. The midrange horn is pretty bulky, so I’d have a friend near by to support them. IF you feel the need to remove the assembly from the cabinet, there will likely be push in connectors for the speaker wires. No tools (or, special skill) required.
Your amp setup may be the perfect companion to your Heresys. Well played.
Best of luck to you. Looks like you’ve made some good choices. Enjoy.