Ok, folks, I think I’ve come up with a less invasive solution and hope it inspires BambuLab to create a process that would solve the problem. You’ll only need a piece of filament about less than 50cm long (enough to go in and out of the end of the AMS). Use PETG or ABS, as they are less likely to break.
Step 1:
Turn off the printer and disconnect the AMS and its PTFE tube.
Step 2:
Remove the plastic piece that presses the PTFE connector inside the AMS, giving you access to the filament-pulling motor. To remove it, simply pull rather than push. If you have larger fingers like mine, you might find it easier to use a screwdriver as a lever. But the piece comes off quite easily; I’ve actually removed it before by accident.
Step 3:
Insert the piece of filament into the slot where you have the filament stuck until you feel resistance from the other filament stuck inside. Put your finger on the right side in the gap opened by removing the plastic piece. You will feel the gear of the motor that pulls the filament, which only rotates in one direction, fortunately in the most comfortable direction to turn with one finger. Pushing the filament and rotating it, you will feel the filament start to move. Repeat until the tip of the filament comes out enough for you to pull it out by hand.
Step 4:
Gently pull the stuck filament out, I say gently because you are turning a motor, and it may generate electricity and potentially damage something (I think 
). Repeat Step 3 to ensure no pieces are left. There, you’ve removed the filament without needing to dismantle everything!! 
For future iterations, I’ve left the plastic piece off and inserted a 60mm piece, enough to use an external connector. I used the printer’s own connector since I had replaced it with a Y-splitter before.
In the future, I believe the process could be simplified to just removing the PTFE from behind the printer and having the AMS push the filament, using another or the same spool. By pushing about 50cm at a time, you could repeat the process until every piece of the stuck filament is cleared. I’m really happy with this approach and have used it more than once. I hope BambuLab sees this and shares their thoughts too. Happy Printing!!!