!. AKI is a great solution. There are others, too (
u-hid for example), but no huge reason not to go AKI for your case.
2. You can go to (maybe) radio shack or a higher end electronic store, and get the opposite gender molex connector, and run the bare wires direct from that. Great if you want to use the sticks on a real cab (or the option to), but actually a little messier IMO than cutting off the molex and wiring direct to the AKI.
3. The one gotcha is that the springsticks do not start centered, and some games, including in mame, can have interfered inputs with this. You'll either have to unmap the joystick from games that use a normal stick, or disable joysticks, or make sure the aki is joystick 5 and up (or 3+ for two player games, or wire the springsticks to the upper 4 axes (IOW, not to X or Y axis) and remap in mame.