there is a better way than “cutting chunks”
keep your 1st 2 tracks as your source clips.
make sure they are level sync at the head and tail
option shift drag ONE of them up to a new track, this is your edit track, so make it the target track.
now when you want to switch, mark an in point in the timeline,
with the playhead parked anywhere after the in point,
double click either of your source clips into hte viewer.
then simply hit F11 to do a “replace” edit
the new shot will replace the existing one from hte in-point onwards.
a note about replace: in/outs in viewer have no effect,
in/outs in timeline do.
in/outs in timeline take precedence in defining the cut, next defining thing is clip boundaries:
working like this, it’s good to have gang mode set to “Follow”
that way you can scrub in hte viewer, or timeline, and the other window will follw your playhead position, so when you do the replace, your shot is still in sync.
cheers,
nick