A touch actually has a serial connector inside. I soldered to mine, but you can buy the parts to make a cable using a cable. The shipping costs more than the parts. You can buy a bag of 10 or 50 of them, with big discounts for larger amounts. You need to order the sockets and the plastic plug separately, and the special tool costs $300, but you can hack them together. Hondamarlboro shows pictures of hacked connectors at his website (linked in posts on this forum).
The k4nt needs delicate soldering, but the touch is easier (especially if you use the connectors).