Patch asks:

With regional variants no longer restricted to gen I Pokémon, it might be a good time to consider which of the Unovan Pokémon you rejected you would like to give a regional vatiant?

Hmmm… tricky…

There’s probably a fair bit you could do by building on the industrial revolution theme that some of the generation VIII material we’ve seen already seems to be going for.  I could see Heatmor getting some kind of region-specific evolution that builds up to a whole steam engine, maybe changing its type to Fire/Water or Fire/Steel (although the implied comparisons to Volcanion or Heatran would not be flattering).  Or even a Galarian form of… [ahem]… grbdr… that’s based on a sack of coal, making it a Fire/Poison-type that also gets Rock attacks.  Then, on another angle, we could have a Steel/Fairy form of Pawniard and Bisharp based on white pieces from the famous Lewis chess set from Mediaeval Scotland, to contrast the original black Unovan ones.  Possibly some sort of “royal” form for Swanna, but I’m not sure where exactly to take that.