A traditional easy out will remove the broken end out of the block, and yes a new one can be installed with the engine in.
Jack it up, sand / grind a small chamfer the end of the new tube to get it started, seems like I used some lube as well.
Takes two guys to install, one under to guide it and another one to tap it lightly into place.
I typically use a short screwdriver in the end and tap on the screwdriver.
NO CHROME TUBES... they are too big around to fit easily..., buy a resto type.