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I have 18"s being made now. Wide barrel 18" will only fit the rear properly due to upper ball joint. My rears are a 11.5" wide, but depending on what you need them for, I'm offering 3pc options so you can choose whatever width you want for drag or a square setup.
Rim OD doesn't affect nannies, it's only wheel i.e. tire OD. General rule of thumb is keep them within .5" of OEM OD and you're fine. You can go overall shorter or taller OD with both and not trip the nannies; however, your calcs would be off for speed etc but that can be changed through tuning if required.
TPMS will work the same, new TPMS just need preprogrammed.