your doing well so far Gene!
Nice teapot to, . Have you christend it yourself yet?

Lapsang, Darjeeling or Earl Grey?
Hes Definatly not amongst listed war dead, so either retired or transfered to another regiment.
The Offcial medal Records are not complete either, there normaly fairly good with Brit Regiments though. {Record of Colonial units records are fairly abismal} Perhaps Terrotorial records are also? Truly dont know. Built up my own data base of Gurkhas wherever possible over the years.
The 2/4th were based at Quetta & Dehra Dun in 1917, but where csm Osborne went after that is realy the questian.
Might be worth trying Truro libary reference section, sometimes one can find an eager hobyist researcher on the reference libary staff, who can do local press cuttings, council records,birth,deaths ,weddings & if lucky stories to...
Spiral