Of course there is some liability for selling something that doesn't care the mandated safety equipment. That is why the manufacturer is not supporting the models in the US. The question is how much liability is there? You aren't the manufacturer, but if the manufacturer can dodge the lawsuit--you as the dealer are next. If you want to do it, set up a Limited Liability Corportation (LLC) and have no assets in the corportation. Separate the corportations finances from yours and have corportation meetings (sounds silly, but you sit down and write up the decisions you have made at least once a year and sign and have your wife witness it). If you don't mix corporate money with your own (i.e. you pay yourself a salary and/or bonuses when you have profits-- and make loans from yourself to yourself personally to the corportation (need not be interest bearing) when the corportation needs cash to buy something, then the corporation is a separate legal entity and the corporate veil is difficult to breach (i.e. liability does not pass to you directly). So a lawsuit comes and if you lose there are no assets of the corporation (because all of the tools, building, etc. is not owned by the corportation but by you). Hard to say the owner of a building is responsible for what his tenant does (as long as it is legal).
Yes, it does take some effort so that you can sleep (and a tax return for your corportation--which actually carries some benefits). But after the set up, it can be done in 4-8 hours/year.
Strictly speaking, you have to act like a corporation with separate bank accounts and tax returns, If you do this and keep no real assets in the corportation, if a lawsuit comes, you can quietly close down and start up under a new name. You pay all your creditors other than any judgement and set up a new LLC. If you do all this, your stockholders (i.e. you) cannot be held responsible for your corporations liaibility. This costs $1500 to set up the first time and then some paper work. Next time (if there is a next time) you can file all the papers yourself for $50.