... or build a diode matrix to translate 4 bit hex switch connections to 2x 7 segment digits. The easiest would be a double sided PCB populated with SMD diodes, but its easy evough to build with through-hole diodes on Veroboard. Don't fall into the trap of sandwiching the diodes vertically between two Veroboards with tracks at rightangles as it makes rework nearly impossible. Instead, for the diode top connections its best to use bare wire, with an insulated flywire for output.
Edit: It does need a 4 to 16 line decoder to drive the matrix - the easiest is two 74xx138 3 to 8 line decoders. Also you may need more drive for the segments so a pair of ULN2003 high crrent drivers on the matrix output may be helpful