If you're just doing this for the sake of your spare, then you're better off just using a mismatched spare. Use the standard staggered setup, and if you ever get a flat, you can put on a mismatched spare on a temporary basis, until your regular tire is repaired/replaced.
Hell, you could even just use a donut, just like most cars use... a tiny little spare tire that won't take up too much trunk space, and although it's not a good idea to run it long-term, you just use it in case you get a flat.
To answer your other question, almost everybody here is running a staggered setup.
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2008 135i Montego Blue sport pkg, premium pkg, Logic 7 sound, iDrive/Nav
Mods completed: JB4+ & FBO || LSD || BMW-P suspension + F/R sway bars || 18" Breyton GTS-R || M3 front bushings || Vogtland camber plates || BMW-P rotors + Stoptech pads |||| Acquired, not installed: BMS WW Meth kit || Logic HVI intake || Mishimoto OCC |||| Shopping for: Summer tires
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