Specifically a ps4 DualShock and a wired hori ps4 controller. After the game loads up while either of these controllers is already plugged in it crashes.

Can you please send the crash report?

I have the same issue, here is the crash file:
crash-2021-05-14_00.28.43-fml.txt

I've made a potential fix. Can you try this version of the mod? https://www.dropbox.com/s/e5bxb95ov15t1lk/controllable-0.13.2-1.16.3.jar?dl=0

Fixed in 36414d1

Ok.

Worked! Thank you!