Ha ha ha ha @ThatPithySheep that is a good spot! I've just looked at my university's guidance: cue hasty withdrawal at top speed by our captured HR department (various colleagues, including me, have the scars to demonstrate the idiocy of our HR people on this matter) :
This guidance document [...] is currently being reviewed and updated.
They give an email address for any questions about "transinclusion"
Thank you, thank you, thank you OfS and Professor Stock!