They will work, you will just be cutting off the sockets and pre-installed terminals. In some cases where you are mounting gauges across the dash, wires may be too short since everything was pre-cut to fit the factory cluster and will require the harness to be modified.
Universal harnesses, like the Kwikwire you mentioned, will work, but also, take more work to install. You will also be re-using every single one of your factory connectors. Things like the dash mounted hazard switch, low brake light, wiper switch-wiper motor, dual tank will also have to be added since they are not included with those style kits.
If you've got a highly modified Bronco that may not be using these circuits, then maybe a direct fit harness like what we sell wouldn't be the right fit and one of our universal harnesses, or someone else's, would better suit your build.