Why would you ask this reposed non-Orthodox to intercede for you?
I've never thought of asking my deceased family members to intercede. After all, do we know where they are, that they are able to intercede? Why does everyone assume that when someone is dead, they must be in heaven, in a better place?
We don't know that.
We pray that God forgive them their earthly sins, and grant them eternal rest with His saints...
Even saints have been known to ask those who pray to them, to in turn pray for that saint's reposed parents or loved ones. Therefore, even the saints ask those who are still living to pray for their departed family members. That always amazes me.
Rather than ask your non-Orthodox departed family/friend....talk straight to God, or if you feel you can't...than ask a known Saint for help.
I'm Orthodox, and that's just my opinion....not necessarily an "Orthodox" opinion....just a personal one.