I've actually managed to get all PBT keycaps on my Advantage2 and Advantage in profiles closely matched to the stock ones. I'm using blank Cherry profiles for all 1u keys, except for Ctrl/Alt/Win/Cmd keys and home keys. Home keys are filled with DSA Homing Dish keycaps and Ctrl/Alt/Win/Cmd keys are filled with SA R3 (R1 would be better but SP doesn't have R1 SA in PBT). Two top 1.25u keys are filled with DCS R1 while the rest of them use DCS R2 (SP hasn't had 1.25 R3 in ages). Lastly, the four 2u keys are filled with blank Cherry Numpad Enter and Numpad 0.
This setup has worked very well for me, and with Cherry profile being wee bit lower than the stock OEM profile, SA R3 keys are tall enough to be used on Ctrl/Alt/Win/Cmd keys.
The big annoyance is the need to get two full sets of keycaps (along with DSA Homing Dish, DCS, and SA) in order to cover one keyboard, thanks to needing two Numpad Enter and Numpad 0 for each keyboard, not to mention 18 bottom row 1u keys. This also means you'll be left with ridiculous amount of unused keycaps