I don't think that's possible because, if I understand correctly, many of the parts need to be adjusted periodically to maintain accuracy. It's not a set-once-and-forget type situation. Those parts need to be able to make extraordinarily precise adjustments repeatedly for the life of the mission.

"Aligning the primary mirror segments as though they are a single large mirror means each mirror is aligned to 1/10,000th the thickness of a human hair. This alignment has to be done at 50 degrees above absolute zero! [0]

[0]https://www.nasa.gov/topics/technology/features/webb-actuato...