I have 1 loose post in a 50' run of fence. Construction is typical
for around he 4x4 PT posts every 8', 2x4 PT rails, 1x6 PT boards
alternating from side to side, PT lattice panels on top. The loose
post moves the two adjacent panels when it wobbles, but the fence is
solid once you pass the next post on either side. Fence is about 10
years old.

There are plantings/shrubs/trees near the fenceline, and probably not
easy to get machinery (ie bobcat) up close.

Is there a alternative to extracting & replacing the post? I thought
about siamesing some sort of support, but not sure what would be
effective w/o being too difficult to install.

TIA,
Chris