The amount of slots has little to do with the map itself. You can easily take a huge map (such as the one above) and only give it 25 slots.
It's a lot of territories, but I don't think that makes it necessarily more complicated.
Let me see if I can build up a template that you can use.
This template should work, to begin with.
- It's got 25 slots, only in Europe. All territories outside of Europe are inaccesible.
- The Italian states are all neutral (except Sardinia), and all German states except for Hanover, Bavaria, Saxony and Prussia are neutral too.
- No cards.
All slots here have multiple (sometimes a lot) of bonuses, so that might be too complex. If you want, you could also give each slot only one bonus (say, France will just have the one "Kingdom of France" bonus, and not all the little regional bonuses). That makes the map much less complex, but will probably mean no one has any income after a few turns.
Let me know what you think!
Edited 1/4/2019 08:09:27