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Thank you both for the input! Mushroom, this is all very good insight for the process after K1. I think that I just want this time apart to end enough that it's easy to overlook the protracted pain which comes with trying to get the green card afterwards. Although she is fluent in English, has been to the US, and would likely integrate, I think she would go insane not being able to work for a year. Also, that would be quite a financial burden. She has a very good job in Moscow, and I think it would be a tough transition to joblessness. 
 
Steve, these are all very good points as well. On the bright side, we are both going to travel to Georgia where we can get married in September. Once we have that, I can at least visit her in Moscow under a family visa, but to be fair I don't know how hard the ZAGS process is. I lived in Moscow for two years under a student visa, but not sure how it is for the family circumstance. As for the interviews, like you said, I heard from another couple that they are planning on offloading some interviews out of Moscow to neighboring countries - her fiance was just scheduled for Poland.

The problem is ability for her to travel to the US and where to get married, if you try for the CR1 route.
 
The ZAGS process is difficult for you, especially since you currently cannot travel to Russia without some exceptional circumstance (family there, diplomatic visa, other mission-critical visa).   Even in normal times people did not have fun navigating the ZAGS process.
 
The best option is to travel to a neutral country, like Turkey, but I do not know how easy/difficult it would be to get married there.  If she has a schengen visa, then an EU country might be able to handle a quick wedding.
 
A single woman with a boyfriend/fiance in America has an extremely slim chance to get a B2 visa.  And I am not sure when the Moscow embassy will start processing tourist visas - they have been closed for well over a year.
 
This is one of those rare cases that I would actually recommend a fiance visa.  The problem with that is that Moscow is still closed.  But she may be able to get her interview in Warsaw.  

The separation time does suck but there are other things to consider as well. After K1, your foreign fiance(e) (who will become your spouse) will not be able to work or to leave the USA for many months (expect 6-8 months until they receive the EAD/AP card). And then to get the green card can take more than a year after K1. This can drive a lot of people insane, especially people who are unfamiliar with the USA. Many immigrants experience culture shock, intense loneliness, a difficult adjustment. And this is even more difficult if the immigrant doesn't speak English and/or they are still learning English. I personally was lucky because I was living in the USA on a different visa before I ever even met my spouse and English is my first language. Emotionally, you want to be together and that's fine. But it is not necessarily true that ending the separation time will solve all of your problems either. At least with CR1, your spouse will have the ability to work immediately, to get to know new people through their job, to practice English more (if they need to) and the financial burden will be split between you both rather than it falling to one person for almost 1 year (which is what you have to deal with if you do K1).