I've lost track of how many times I've seen people wishing for something like this from their favorite manufacturer. Think about just what that would actually entail. They would have to sell a set of fasteners (especially if they went with threaded fasteners) of a specific length to match every possible combination of tools and liners that anyone could possibly want in each of the seven frame sizes (because face it, once you start down that rabbit hole, there is no end to what the customer will demand), all of the components (individually of course, because no one wants to pay for a part they don't need) for each of the frames (you know someone out there is going to want a woodsaw for his 58mm), springs for every combination and for every tool by itself, catch bits to make any combination of thick and thin blades work on the same spring, nail nicks on either side of each tool...the list is endless. Then, they have to engineer it all so that any fumble fingered moron can assemble it without the special jigs and tools they use in the factory, getting the right amount of spring tension to make the whole thing work properly. And of course, they have to make the whole thing idiot proof or they'd get sued into bankruptcy in a year.
Being able to make more money by not doing so isn't the reason they wouldn't.