just create a dummy droplet in the old region

then attach the volume and copy to local ssd

power off dummy droplet

make a droplet snapshot

copy the droplet snapshot to new region with make snapshot available in region-option

delete dummy droplet

create new dummy droplet in new region with snapshot copied

meanwhile create volume in new region

attaach volume to dummy droplet

boot

copy files to new volume

verify files (is all here and ok?)

shutdown

delete dummy droplet, temp snapshot for move, volume in old region