In my freshly renovated kitchen I have a bunch of FÖRBÄTTRA 60cm LED light panels paired with an ANSLUTA 30W transformer and daisy chained 10W transformer (more 24V outputs) controlled by a 2.4GHz remote.
I can confirm the voltage levels at 0%, 50% and 100% brightness are 2.2V, 22V and 24V.
I was surprised to find that a 0% brightness (off) the panels were still supplied 2.2V!
The 30W IKEA driver says it provides 24VDC, 0~1.25A, 30W max.
The 10W IKEA driver says it provides 24VDC, 0~0.42A, 10W max.
On both drivers it says you can chain up to 10 drivers and each 220-240VAC input is rated at 2.5A.
The receiver board inside the transformer enclosure uses a Fairchild FDD8880 MOSFET, which may give you more clues. The 2.4GHz transceiver is a Texas Instruments CC2500 and can only pair with one remote at a time.
I can't see any technical reasons why you couldn't drive the panels with your own 24VDC source.