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About 30 years ago I worked for some small toilet of a company that made accessories for CAT scanners used in hospitals. The product was a device that converted video images to hard copy on Xray film. All there really was inside the product was a B&W video monitor, some lenses and shutters and a cartridge that held a piece of X ray film, and some control electronics that would open teh shutter for a fraction of a second to expose the film. Anyway, one of these boxes used a modified Conrac QQA monitor (which could, via a selector switch on its front panel, handle 2 different scan rates. One was 525i, and the other was pretty much 525p. So? you ask... Well we changed the CRT from the 13 or so incher to a small 5 inch flat screen one. Made for a smaller but a flat video image, which was great for the photo lenses and film. No distortions from a curved screen. It was pretty much plug and play. We could have used the orginal yoke, but the company president and marketing guys wanted us to try the "high precision" yokes they got from somewheres. We said we can't promise that it won't blow the chassis up, but okay, if you want to risk it, we'll try it. Could have been a big impedance mismatch. Well, it did work...
I see the pictures of your monitor you just posted, and it looks to be the same vintage and style of chassis as the stuff I worked on above.
Getting a CRT to fit shouldn't be that hard, you could carefully! measure the voltages on the socket pins, these can be upwards to several hundred volts, so use extreme care (but don't measure the voltage on the big fat red wire, that's something like 15000 volts). And compare what you measure to specs for CRTs you can find as replacements.
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