You could cut your lengths to long enough for 3 or 4 compts - stick one in each stepped jaw vise. Face the strip minimum cleanup, do the work on the top and cut the profiles just deep enough to put the chamfer on. Spot drill holes in components to create a chamfer. Put in four nice holes at opposite ends of each strip as a register for the second op.
Second op would be a tapped plate, on which you locate the 3 strips using opposing pins/bolts thru four tooling holes. Face the strip to size, stick holes in components and clamp thru holes. Finish work on top then cut out components.