I know what I’ll propose is the option I’d like the least myself, but I will anyway recommend that you try switching to a different program.
Since the problem is that your work memory is not sufficient for the task, you should try vReveal. It enhances its processing power by borrowing memory from your graphic card, which just might be sufficient to allow it to complete the video without splitting it. It also makes this program much faster.
But the most important factor is that it is very good at stabilization because it was originally developed for the military, and is used on drones. There’s also a free version available for download.
Good luck!