Not easily, but if you can program, you can grab (prevent them from passing events to anything but your program) both /dev/input/eventX devices, read keypresses from either, and output them in a single user-defined input device (/dev/uinput).
C example programs on how to use those kernel APIs exist. Other languages are also possible.
The USB Human Interface Device class is standardized, therefore the keyboard should work.
Maybe the fancy features like macros and LED lighting (assuming this keyboard has them) won't work; I couldn't find much info in a cursory search.
I've tried without success:
It work's with capital letters:
Thanks for @ferranm for you answer it guided me.
Pd: tested on
Linux raspberrypi 4.19.50-v7+ #896 SMP Thu Jun 20 16:11:44 BST 2019 armv7l GNU/Linux