With the remapping feature in the Kinesis Advantage keyboards you can't do it 100% for Colemak. You can move the main keys and their shifted variant, but the Option/Alt layers might be different.
With the Advantage's firmware remapping you not only move the lower case character itself, but all of its key's layers too: the Shift layer of course, and also the Option/Alt layer etc. With Colemak those layers are often different than with QWERTY.
Here's a comparison between the Apple Colemak and the original Colemak. The Apple Colemak did move all QWERTY keys into Colemak positions
including the Option/Alt layer, and for this reason it's different than the original Colemak. The same thing would happen if one used the firmware remapping feature instead.
Apple Colemak:
Original Colemak:
So, firmware remapping to Colemak with a Kinesis Advantage can work if you don't use the Option/Alt layer much. I do use it for the occasional character with umlaut, like äöü.