You're on to something here. Suppose one or two of them are hiding out in a hotel in, I don't know, Nebraska. They're spotted and tracked, but their trackers keep a distance. In the meantime, the republican Senators are sent to the location where these democrats are located and have the vote at that location. In essence, hold the vote in the hotel lobby or bar.
If you can't bring the democrats to the Senate, bring the Senate to the democrats!