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This isn't necessary. The panels are even thinner than the foam pieces that need to be removed, so there is no additional stress on the LCD.  Also, the housing has four "spacers" for the screw posts. So without it, you're either physically bending the PCB to put the screws in all the way, or the PCB will be floating a few mm.

There's a tutorial on the LSDj wiki.

You can also make an adapter instead, and it saves you from modding the unit. Panel mount ps/2 sockets are hard to come by. The only ones I've found have to be glued in.

Your keyboard seems to support both USB and PS/2 protocol. Just judging by the pin indications. Sounds like it's not starting in PS/2 mode.

Another possibility is your DMG isn't getting enough power. So if your batteries are low or if you're using an AC adapter that is not supplying enough power, the keyboard won't work. You may still see the LEDs light up though.

As for testing, I have a PS/2 adapter here with some cosmetic flaws that I could sell you. So if you have a different keyboard, that would be a good way to test it.

Well the header has pinouts for a USB cable, but the silkscreen says PS/2.

Try connecting data- to clock. That's how it works with PS/2-USB adapters, I'm pretty sure at least...

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That's not how game genies work. The game doesn't need to have "codes", game genies alter the rom data.

So yes, it's hypothetically possible to use a game genie with LSDj. Underclocking is a hardware thing, and if a game genie could get more potential out of LSDj, I'm sure Johan would have already taken advantage of it. Could be some practical uses, but I can't really think of anything.