I'm puzzling over how to solve this in the best way. I need to let the baseboards meet between two rooms where there's nearly an 8 mm height difference between the floors, and there is 20 cm of wall between the rooms where the baseboards will be attached.

If I just let the baseboard follow the floor, it will look odd when it meets the baseboard in the next room. How would you guys do it? Miter the baseboard and mount it sloping, and put a thick threshold on the floor? Attach a small molding at the bottom to cover the gap created? Or would you be ambitious enough to glue two baseboards together and then plane them down to fit?
Baseboard installation challenge between rooms with uneven flooring showcasing height difference and alignment issue on dark wooden floor.
 
The most common approach today seems to be placing a strip from each side that meets at different heights at the threshold, then painting the end grain of the higher strip.

However, I would do the same function by routing a custom baseboard piece that covers the entire distance with a small fun "knick" in the middle, but that involves a few extra hours of work and assumes you have a router and preferably a router table available.
 
Instead of trim between the rooms, maybe one could place a higher block there that the trims connect to. Kind of like a skurkloss but as wide as the portal.
 
Cut away 8mm from all the skirting in the room with the higher floor.
 
I probably should have installed double moldings. One behind that is higher and one in front that is lower. Unfortunately, the lower one that comes towards already mitered, so that complicates things a bit; it should have been longer to meet the outer molding. Double moldings don't look as bad as you might think... A bit of latex on the end that sticks up "magically" hides the transition.
 
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