I have had the main jets and emulsion tubes out.

Do the blockers just pop out down the same hole as the emulsion tubes?

They still feel quite solid.

P.S. Did my first run in. In the 5 minutes of revving after I hit operating temp the temperature gauge almost got to the top notch, just before the red area.

It was 30 degrees at least and I was revving the bike on the spot but I just want to check this is ok. I didn't end up rebuilding the water pump, but if it's a bit sluggish I might have to.