Instead, I replaced it with a DIY, industrial-strength, solderless LVI, which I'm showing off today. For those who want to create their own DIY LVI, who don't have the ability to solder, or who just struggle dealing with stripped RJ11 wire like me, this is probably the best design out there. And it fits into a fancy case to boot!
It uses 2 RJ11 wall plates (which attach the RJ11 pins to user-friendly spade terminals and screws on its keystone), solid-core copper jumper wires stripped and crimped with spade terminals, and a mini-breadboard for the LVI circuity itself. Everything fits into a small metal tin, which can easily be found for cheap at craft stores. Holes were Dremeled out to fit the RJ11 wall plate keystones, wall plate screw holes were drilled out to the top/bottom, and the plates were tightened down to the top/bottom of the tin with short screws and nuts/washers. The black, green, and yellow pins between the RJ11 wall plates were just jumped (direct connection), while the red pin was jumped over to a small breadboard. That mini breadboard has the LVI circuity for applying the voltage, and is attached to the bottom of the case with the adhesive tape on the bottom of the breadboard. Total cost was ~<$15 USD, and the circuit implemented is just the simple LVI from online-consoles website.
Pictures:
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