There are two places you can turn your wing beacon on and off in a ship - in the roght hand panel under the ship tab, and in the comms panel under the wing options.
However, once you are in the SRV, you can only use one of these options - the comms panel. Could you possibly add the Wing Beacon switch to the SRV tab as well. There is planty of space there, as there are only 4 switches.
https://1drv.ms/u/s!Al3tfuLJYLa6g84Fgwd9eTHkzLlxyw
https://1drv.ms/u/s!Al3tfuLJYLa6g84GN3WTQbVUBELF2A
However, once you are in the SRV, you can only use one of these options - the comms panel. Could you possibly add the Wing Beacon switch to the SRV tab as well. There is planty of space there, as there are only 4 switches.
https://1drv.ms/u/s!Al3tfuLJYLa6g84Fgwd9eTHkzLlxyw
https://1drv.ms/u/s!Al3tfuLJYLa6g84GN3WTQbVUBELF2A