All my red and blue series dimmers show up as outlets instead of dimmers. I'm using the Inovelli custom drivers and am on a C8 with software v2.3.6.136
Drivers:
Inovelli Dimmer 2-in-1 Blue Series VZM31-SN 2023-07-01
Inovelli Dimmer 2-in-1 Red Series VZW31-SN 2023-08-14
Figured it out. If you enable "Show accessory classes and characteristics" at the bottom of the HomeKit integration page, you can then export devices to other types.