I have an answer about using the Tamiya apple on the SLU.
The answer is NO, because the apple in SLU is not only a receiver, but a processor. Hence if we use TBU, No correct signal will be transfer to SLU main board. In simple words, the apple of SLU is whole IR battle system.
That is not to say that you could not create a cover for it that will give you 45 degree defense and fins as Phil has done with the DBC. I will look into doing the same for the SLU.