Hello, Boroda! for your case you may use standart strategy without any doubt.
1.So the MORA already includes 2000' clearance + another 2000' over the MORA. So you will have 4000' over the highest mountain peak, even if you have instrument error due to the strong wind the clearance is well.
2. from another hand the standart strategy (as it have been said by you) decreases the time spend in the air with one engine operative.
3. drifting down from FL350 to FL220 will cover 100nm, I guess that is rather good to reach lower MORA.
P.S.: don't forget about another strategies as you fly over post soviet region.
con respecto!