I would also recommend getting some Dupont connectors for easy removal after programming. You'll be needing to buy a Raspberry Pico at the very least. You mention one may be a Trinity, seems like a simple one to do. Honestly, I would recommend trying the RGH3 method. Luckily I checked it while messing around, cleaning, replacing the drive motor. I know the thermal paste was damn near completely gone and only crusted around the edges of the chip. I'm unfamiliar with the life this console led though so I can't really say how well off the capacitors are in it so I'll be checking those once my diodes arrive. With this particular console I found that 10 MHz actually showed better results. This is similar to timing files for the numerous chips out there (Cool Runner Ace V3, Matrix, etc.). Another point is: you can try different methods when flashing RGH3. I've ordered some proper 1n4148 diodes to remedy this. This last Falcon I modded literally takes about 5 minutes sometimes or doesn't even boot at all. But I left out the diode because I simply didn't care how long boot times took.

Now I have used resistors for each because it is HIGHLY recommended to ensure safety of your console (on these occasions, 22k Ohm for each).

I've done a few of these myself, two Falcons, a Jasper with RGH3 work great for the most part. I know others have mentioned some things to elaborate on what you were saying here and then some but figure I will throw in my two cents.

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