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The Italeri French staff set has some figures which are fairly easy to turn into Russians. Cavalry generals were usually in some sort of regimental outfit, and Art Miniaturen Prussians, particularly the ones in overcoats, can also be turned into Russians with a fairly simple paintjob.
Hope you'll post some pictures when it's all done!
1. put some dismounted horses behind them to show they've dismounted or don't even bother
2. with the right paint job, I'm sure you can use figures like the Tsar to represent just another general. Maybe some minor conversions to add variety.
3. If you're feeling the need to really cut and paste, cut the Strelets French mounted set generals at the waist and replace with suitable looking Russians
and don't forget the Italeri Russian - Austrian general staff. 2 mounted generals and 1 general on foot. and the pavlov officer could easily converted with a simple headswap.