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Nice, I love OPL2 and your FM-YAM videos :]

I'd add a buffer amp still. Look into integrated amp ICs, these come in DIP8 packages and typically require only a few additional components. They typically include the required schematics inside the datasheet as well. As an example, look at TDA2822M (example usage).

When you've got the NES open, I'd also suggest replacing the 1A 7805 regulator with a 3A one if you're gonna do some additional mods (I added LEDs, couldn't resist...). Or better yet, some modern regulator that doesn't produce as much waste heat, but that'd also require some reading into the schematics.

Oh, and I personally disable the CIC chip for stability reasons

All right
It's definitely a worthwhile mod, I had tons of fun even with just these two fixed channels...

The 2A0X outputs two analog channels, first is the mix of the two pulse channels and the second is the triangle / noise / DMC. After that, there is the external amplifier, which mixes these two (already analog) signals together. The formula in the link describes the INTERNAL DAC for each of the channels.
To answer your original question, no, there isn't any way to get to the digital representation without decapping the 2A0X. You could do a stereo mod + custom amp by just using the two analog signals directly from the output pins. I've done that personally, the noise floor was about -60 dB.

Timing is derived from the crystal oscillator, the frequency of which is then divided to some much smaller value. So the CPU type doesn't really give you any advantage or disadvantage. I don't know where the master clock for LSDj comes from, but I'd have to assume it uses the screen refresh clock at ~60 Hz. I believe LSDj can be synced externally via MIDI, but I've never done that myself. Someone else will need to help you with that :]
What I'd do is I'd use the gameboy as the timing reference and sync the FL project with that, as it's easier to do.

As a bit of a side question, if you're willing to go the PSP emulation route (and that's what it is at that point, emulation), why not go the full emulation route on a PC then?

That being said, from what I understand the DMG is preferred for its sound because of its analog circuitry.

tl;dr DMG + either MIDI sync or sync your project to it instead. Just my two cents.

Holy fuck this is nice! Nice collection as well!

Also I love the idea, great way to discover new music :]