Good thinking, eventhough these are no longer for sale in the DT store.
BUT
Amal said this the other day.
So IF the original Spark is compatible, you could ask Amal if he was referring to the performance of just the LED or the Spark also.
Then you would have to convince him to sell you one, knowing that the LED doesn’t work well.
FYI, My Original spark performs really well
OR
get the xSLX