If all the above still generates too much noise ... cheat. I have a store bought "atomic clock". Bought ~1996. Cost $170 back then, and I considered it a bargain. It only uses the receiver once a day, at midnight, to correct the time. So what you can do is, at say 3:00am, shut your switching supply off, and of course, the nixies will also be off. Turn ON the receiver, and update your "internal time". Then run off of the internal time, after your turn OFF the receiver, and switch the supply back ON. If you're gonna have a uC in there anyways, you might as well let it do something that resembles "smarts".
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