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I believe the K3 is not a candidate for QMK et al, but as you are using Linux, you could give the following a try: https://github.com/rvaiya/keyd
While there is QMK for the K3 https://github.com/SonixQMK/qmk_firmware/tree/sn32_master/keyboards/keychron/k3 it seems to be for the RGB variant only while your K3A1 seems to be white backlight according to https://www.keychron.com/blogs/production/project-update-for-the-k3-pre-orders-1
NOTE:
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Hence, a higher number means a more popular project.