I would not be surprised if someone came up with a kit that would indeed turn a lever action into something that fires continuously.
If a full ban gets started and indeed America prepares for the second revolutionary war millions of new AR owners will be searching for burst and full auto sear kits, or getting a 3D printer to make copies they can then use as parts for molds and to then make cast metal parts.
Because of the superior firepower of multiple agencies with a lot more ammunition Americans need an edge other than being numerically superior and having bad breath.
Take out the bottom of the rifle where the clip resides and install a magazine or belt feed capable mechanism and one has a fairly portable mini-gun—retool the works to allow fast barrel replacements and you have a very accurate and deadly weapon.
You know, If the fascist gunphobes do succeed in taking our semi-autos, it will indeed create a cottage industry in home grown AUTOMATIC weapons—then the Obama jackbooted commie thugs will have a real time.