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On a warm day with direct sun it will work well. When that video was shot it was a bit overcast, and yet I was still able to do it WITHOUT using a hot wire (the transformer I had connected to heat the wire was not actually connected to power during the video so the wire was cold).
Use guitar string for wire, thicker handles (mine were pieces of paint stir sticks) so the screws stay in the handles, and if you find you need to heat the wire use a step down transformer with a 12V or less high current secondary (use the secondary for the hot wire)...As long as you do not use an auto transformer for the wire it will be isolated from line voltage and thus safe....12Vac is not enough for dangerous (or even noticeable in most cases) amounts current to flow through the high resistance of your body...Auto mechanics work with 12V all the time, and I don't think you will be able to find a single case of them being harmed by electrocution from battery voltage....
If you use a decent sized bucket you can keep all the neck hardware on the CRT (and let the convergence board hang by the yoke) and simply pack it in the bottom of the bucket...I've done it that way on sets that aside from the cataract were in perfect operating condition and been able to remount the tube without any need for adjustments....YMMV.
If you let the summer sun slowly warm it for an hour or more, and then let it cool in the shade after the wire trick the risk of implosion should be low...Heck I was once stupid enough to set a sun heated tube with the glass half chipped off (RCA procedure that went bad) into a shade cooled pool of water a good 30 degrees colder and it did not implode, but instead the screen cracked 30 seconds later.....Yeah, not one of my better moments.
I'm roughly in your neck of the woods, so if during the summer you want me to help you or do the cataract removal for you send me a PM.
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