Any bearing you can get to the inner race, you can throw a little bit of heat at and then draw the shaft in with the puller.
Have watched some vids - but subtitles always come out with input like this.
Main bearing installed into casing after main seal on clutch half. Use crank puller to draw in crankshaft into clutch main bearing. Use hot plate or oven to heat fly side casing and drop onto other half.
Now... its getting interesting.
No. Your exhaust needs a different shape for a different job (sidecar).