I don't think the wedges are magnetic.
In any case, I managed to wiggle the yoke loose. Using AMiga Deluxe Paint for test screens, I managed to get the yoke to display a correct picture both in terms of colour and tilt. Fixed the yoke with the screw. Reassembled and connected everything and...bad corner. I had fixed the yoke facing east and use the TV facing north. So now I've done it again facing north. I've also corrected the horizontal alignment. I still need to put new adhesive on the wedges and apply it, then put the TV back together, and hope everything is still OK after all that.
Here's the evidence attached. And I'm still alive! Even after my forehead touched the -luckily still OK- anode cable when I dove in too deep.
I'm not claiming it's all 100% but to my eyes it is, and the quality of this monitor really shows. In real life, not on photo. People rave about the Philips Personal Monitors, but these Trinitrons have better resolution, less apparent flicker, and a better image. And they fit in the same convenient space (both 14" monitors with small housing) and are period correct. I can also confirm that, even though they are PAL spec, they sync up to 50Hz just as well as 60Hz.
They are really sensitive for stray sync signals, so if you use a SCART switch, make sure all sources are off except for the one you use. And apparently the monitor only auto switches to SCART on the Amiga's higher resolution, not on the lower res of the Sega's and C128. But that's just one button press to get going.