Hi BelArgUSA,
I remember operating some flights to Russia a while ago.
I agree with what you said however you have no other choices but to convert when you get a CLB or a DES to a FL in meters by ATC. As far as I know, the MCP ALT window is in feet
A metric altimeter can help you crosscheck you are maintaining the correct FL.
We used a feet/meters conversion table.
For QNH/QFE conversion, I completely agree with you. You will be prone to errors some day specially with high elevation fields.