Hoi - I am not sure whether this plug will work everywhere - have a look here: https://world-power-plugs.com/de... - at best, a universal adapter would certainly not be wrong.

Then: https://nepal.de/reiseinfor... ... electricity is obviously not quite as stable as it is here...
At best, I would recommend the use of a power bank for charging when there is no electricity (at least mobile via USB, your cam(s) via USB, if the cams can be charged via USB) - which you can also take with you on the plane and which is not so heavy to lug around...

Universal adapter:
https://www.digitec.ch/de...
Powerbanks and the airport:
https://www.flughafen-zuerich.ch/en...
Check with your airline to see what's OK and what's not....
the powerbanks would be here:
https://www.digitec.ch/search

Have fun in Nepal (I would also like to go there again), stay healthy and have a happy new year. LG