I'm inclined to agree - it's unlikely that your keyboard is "bad" - but figuring out a pin arrangement for the first time is not easy, especially if your only tool is a multi-meter.
Your easiest solution would be to buy the connectors from Midiboutique.
But if you want to do it yourself, I suggest you bite the bullet and make up a connector based on the information in my document and try out your keyboard with your HWce2x encoder, using Hauptwerk or MidiOx.
You need two lengths of 16-way flat cable, each with a Micromatch connector on one end, plus one length of 16-way flat cable with an IDC connector on one end.
Then you need a means of connecting the plain ends of the two Micromatch cables to the plain end of the single IDC cable, as per the picture in my document.
You can attach a 16-way cable-mount IDC socket to a piece of flat cable using a small vice. But I strongly recommend that for the Micromatch cables you buy a made-up connector with a Micromatch plug on each end, and cut it in half (unless you have access to a special tool for attaching the plugs to the cables).
Before I made up a permanently soldered connector, I experimented using screw-in terminal blocks to make the connections.
Unfortunately I no longer have the Fatar TP-60, so I can't tell you exactly at which corner of the Micromatch connector you will find Pin #1. But once you have identified Pins #1 and #9 on the first Micromatch plug for note 036-C, and Pins #1 and #13 on the second Micromatch plug for note 086-g#, it should be fairly plain sailing
Graham