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Are you sure this never happens when running LSDj. Does it freeze in the menu or when loading files or doing other operations? Try to see if it has anything to do with light shocks, like putting down the Gameboy on a hard table. (Not violently or anything.)

If you put in a 1/4" you wouldn't even be touching anything that has to do with the video.

Look at the pinout. All of the five pins in the DIN5 part of the connector are already taken. These are the first five pins when counting the pin numbers. As a sidenote, this is why the DIN pin numbering seems "weird". Pins 1-3 are the pins present in DIN3, which is three pins placed at 90 degree angles. Then pins 4 and 5 between those, with 45 degree spacing. And finally DIN8 which adds three more pins, while keeping the existing pin numbering the same.

Anyway, even if there's no free pin you can use immediately, you could cut the PCB trace going to the luminance connection and route a wire around the board to connect to that solder point. Assuming you use composite for video and not component. However, that would require a custom cable that would only work with your C64. In the end, it might not be worth it. If you're not afraid of drilling in the case, you could just as well add RCA or 1/4" jacks which are more standard and might serve you better in the future.

Well, from your reply I wasn't sure if you understood my post, so that's why I pointed out the regulator/converter thing. Since you mentioned 2.3 V, even if a made up number, I assumed that what you were addressing was the problem of the voltage being too low when the batteries are about to run out.
With regard to the LCD, the first thing to do is to establish whether the LCD is at risk at all. If not, you can just use a 9 V battery and be done with it.

A voltage regulator is just a self-adjusting "resistor" (also known as a transistor, you might have heard of those) that does the same thing as described in the calculation, but over a big voltage range. From about the output + 1 V up to when the regulator circuitry breaks down. The downside of either the resistor method or the regulator method is that energy will be wasted as heat to warm up that component. The downside of sing the resistor method in particular is that the voltage seen by the Gameboy will go down as the battery's voltage goes down, which makes  the Gameboy use more current to maintain the same power. You might also get a change in LCD contrast when LSDj plays versus when it doesn't, as it enters a power save mode when it's not currently playing.

Thing is, the Gameboy has a so called switching voltage regulator which can handle a wide voltage range, from at least 4 V up to maybe 9 V or more. The voltage regulator is of the switching variety, which means it regulates the voltage level by turning the input voltage on and off at a high frequency. The DMG regulator also has a transformer which allows it to both boost and "buck" (lower) the voltage.

The potential problem, apart from going outside the range that the components in the regulator can handle, is that the LCD supply voltage will vary with the battery voltage. The increased voltage with increase LCD voltage could (Not will. Read exactly what I said.) destroy the LCD on the extreme contrast setting. This remains to be seen, however and it should always be safe for the LCD as long as the dial is set to a normal, legible setting.

You probably have a loose contact in the link cable, or there's corrosion on either the link port plug or jack.

Infinity Curve: Make sure you have the new version of the ROM. For the first maybe 12 hours after publishing the post, the link pointed to an older version of the ROM with none of the functionality described in the post exceot being able to press up or down to change the pitch. If you have the older version, where none of the features work, upgrade. If it still doesn't work, I'll have to have a look at it.