yeh those stems are pressed in, i would first try and see if you can get bearings to match. go to a bearing shop with your IDs and ODs and see if you can get it. i would want to keep the honda stem in there. or you could get a new one machined up.
the commentators said that cachia had speed earlier on in the day. yeh, its only the first round, plenty of racing to go, the OGs will all get wins in the next few.