2 way switching of extract fan

[adrian55]

i have a toilet compartment and a separate adjacent shower room and i am fitting one remote extract fan, via a Y splitter to ventilate both rooms. But, ideally i would like 2 way switching within each room (the shower room would need to be a pull cord) but with a neon or other indicator on the switch so the user knows if the fan has been turned on by a person in the adjacent room. But they dont sell 2 way switches with indicators. Is there any solution for this, please?

 

[Avo Mk8]

MK make a base only unit for their pull-cord switches K2056 that has a neon indicator in it.
And there is a 2-way light switch in their range that appears to fit it K3131
I haven't researched who keeps stock!