My experience with Russian tubes, the 3LO1 in particular, is that they barely last 500 hours. I did an extremely simple scope clock six or seven years ago and I was going to publish it for anyone to make, but I make the mistake of mentioning it on this forum and within days the Russian seller tripled the price of the tubes. I was so annoyed that I sat on it, and then I noticed after three weeks the brightness was fading and in five weeks it was so dim that you couldn't see it in daylight. I switched out the tube and the second one faded in less than 4 weeks. Such a pity, it was a real cutie. So your point 6 is important - secure lots of spares.
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