Ah ****... You posted those the day after I got my set of "engine cleaning brushes" lol!! Oh well they work for now.
I used the Dowel extraction trick today and it worked great. As it turns out the only m10 1.25 bolt I had that was long enough was an old case bolt. I use a combination of two 1/2" drive impact sockets and a wide 2mm thick washer against the case. I did not have to add any extra washers before the dowels came right out.
With the case bolt you need about 6-6.25 inches of socket/ tubing for the case bolt to pass through. As mentioned before make sure the opening is large enough to pull the dowel into.