I think that if you were going for 'Count as' SOB, you could just use SM Plastics with Catachan, Empire and Bretonnians.
After all, Sisters have good armor, but don't have the 'enhancements' marines do. So just using 'normal' guys for your marine might do it.
Of course you could go really crazy and do scouts with shields to represent their 3+ save. I think that could be visually striking and fluffy.
For inspiration 300 for round shields or Roman Legions with Tower Shields. Then think of those badarses carrying bolters, shotguns, etc.
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