Rules cover the Bakumatsu?
The rules do not have a set time period. If you want medieval, then don't use Teppo. If you want Tokugawa Shogunate, reduce the amount of armour. If you want Bakumatsu just add a few more modern weapons from Daisho's stablemate, In Her Majesty's Name.
Daisho lets you play at three levels;
1. Historical (i.e. Kagemusha), you just ignore all the mystical and extraordinary skills and creatures.
2. Heroic (i.e. 13 Assassins), add in the rules for heroes channelling their Ki to perform extraordinary feats.
3. Legendary (i.e. 47 Ronin), use the full set of magical powers and mythical creatures.
With an open points system you will be able to develop and field pretty much anything you want, you are not stuck with the buntai and creatures published in the book. If this goes the way of IHMN then we and the players shall be devising heaps of extra, free, material over the coming months and years.