I’d have a look at either Warmaster as it’s designed with 10mm figures in mined, or any of the unit based games such as KoW and work out an appropriate scaling mechanism for 28mm down to 10mm. We used to play KoW with pretty much full sized 28mm unit bases, packed with 10mm figures (IIRC it was 2 Warmaster units to make a KoW unit). But you could down size the units by whatever movement scale factor you are using (eg inches to cm) and use smaller units.
Oh dear, no. I've been a fan of Warmaster since it was released, it's the exact opposite of what I'm after for the project. If anything, I'd scale it down again and finish my 2mm Warmaster project using Irregular miniatures.
Kings of War (and Mantic in general) I'm not into at all despite my name in the 2nd edition book as a backer and owning a few armies of their models.
These figures themselves will be used in solo tests of Spears of Valour, Fights of Fantasy and maybe a few other indie or lesser known games. Surely something from Nordic Weasel and occasionally I read the 2nd edition battlesystem rules and want to try them!
Minihammer/Warhammer connection and individual basing is more me wanting to feel I've finished a Warhammer style army. I have small forces for every WHFB army, but nothing finished. Completing some units in 10mm scratches that itch.