@notanastronaut
Without consulting the restrictions of your airplane, AOC etc?
For example the 737s we fly and used to fly to Russia can not be operated I. QFE, that is a very strict restriction by Boeing ("prohibited"). Operating in QNH is not a problem at all though as the Lido eRoutemanual has all the information needed (back when we used jepp they had it too, only the EAG material was insufficient and aditionally plagued with a very bad chart representation). Not to mention that you actually get a QNH if you ask for it, at least at the aiports we operate to including the Moscow area.