I would bid anyone caution with this idea. It may feel tempting, though trust me, I've been participating and organising the events like that for a while now and to me these progression threads seem like the better and more efficient alternative.

For a single skirmish, you will probably need at least one DM. Then, if it is between players and has actual stakes, you will need a system for rolls and interactions that can get as convoluted as this one I use as well. And even then, you can count with the fact that these skirmishes will get boring very, very fast. The characters are bound to do the same each and every time, since it is their job in a war. And there is only as many ideas for a specific skirmish the DMs can have. Interestingly, when nearing the end of campaigns we tend to have more-and-more announcement-progressions over actual skirmishes too.