top latex machine brands are HP & Mimaki. haven't bothered researching anything else.
my HP26500 runs right next to my design computer, zero fumes & no exhaust system required. The only smell that comes out of it, is that of hot vinyl...which smells like money to me
we used to have MAJOR fumes/smell from our Jv3 Solvent printer, even with an exhaust system moving air from the machine out of a vent in the roof. i got used to it, but everyone else in my office always complained. Now, with the Latex printer, everyone loves how warm my office gets in the winter time and actually hang out by the printer during breaks to watch it print and warm up their chills from the shop.
helmet decals? maybe stick with the edge? idk. 48/54/60" printers seem like overkill for such small tasks BUT it will print them just fine.
however, the edge allows you greater variety in colors/foils than the CMYKLmLc can manage ...mainly metallics, which I'm sure is a huge upsell on your-end.