@GeorgeSanJose there’s no way to do a ring job without removing the pan and head.
You have to take measurements and determine what size rings you need.
The crank doesn’t absolutely have to come out, but you have protect it from any debris when you’re honing the cylinder walls.
The preferable way to do the job is on an engine stand, but some crafty guys do it installed.
Not for the faint of heart!