I suppose the can be modified for a quick check on any two or more wire connectors.
Sure they can. Many of the ones sold for computer cabling use have jacks for 8P8C modular, 6P6C modular and USB, with the jacks using line 1 up to whatever the maximum number of pins is needed. But you can also get units which work the same way and have 1/4-inch or 3½mm jacks for mono and/or stereo audio leads, 3-pin XLR, etc.
But with the ones which only have 8P8C modular, you only need to make up adapter leads to whatever connectors you need.