Westwind Productions in their 'Classic Vampire wars' have dismounted 'Draculas Evil Cossack Guards' (
Vampire Wars proper) and as potential officers 'Tszars Bodyguards' (
Romanov Holiday).
Privateer Press has very 'VSF looking Russians' among their Warmachine
Khador miniatures. Similarly GW has (had?) a 'steampunk Russian' (Vostroyans or something) in the IG for 40K. Both probably oversized with regard to most other ranges?
Copplestone Castings '
Back of Beyond' contains more (but perhaps not too much) modern looking Russians such as the
Siberian Rifles and various 'White Russian Cossacks', but only as
cavalry.
Knightly Orders in the Holy Land fielded locally recruited Turcopoles: I'm thinking of OTW
‘England Invaded’ Turk soldiers, since you mentioned your St John Knights had acquired 'advanced' Ottoman technologies

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Btw are not most of German-speaking Swiss *Protestants*?

Not to suggest Pontifical Zouaves instead -Swiss Zouaves?

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