All displays are 'after market' the motors do not come wit a proprietary display at that price point.The OP is looking to replace the display with aftermarket one.
In my experience, there's no ebike company that would recommend, suggest or okays replacing anything with aftermarket parts.
Bosch MAY be the only vendor with proprietary displays, perhaps Shimano.
APT makes displays for loads of bike manufactures, they get branded at the same factory with the respective Company Name