I haven't found a way to get those bulbs out, either. If anyone knows the secret, please let us know! I didn't want to pull too hard for fear of crushing the glass. But I would like to swap them out for LEDs, as all my other bulbs have been updated.
FYI, the two courtesy lights (on the driver and passenger side) are likely wired to the house batteries and have a fuse back in the SMB-installed fuse block, while the center dome light remains hooked up to the van battery (if I recall correctly) and the door pin switches, with the OEM Ford dome light fuse position.
I don't think any of the three fixtures are OEM Ford, but rather are SMB installed aftermarket ones. Don't assume bulb numbers based on the stock dome light.
I have a 1998 Ford SMB with what sounds like the same setup and I redid my headliner this summer and got to see the wiring spaghetti underneath firsthand.