Hey. Nice looking map. Testing how a game works without neutrals is an interesting idea, and I will be interested to hear what the experience is like.
I'd like to nitpick a bit though and point out that every province on the board has its name in English except for the Swedish provinces that have Swedish names. Appropiate English names would be Scania instead of Skåne and Lapland instead of Lappland. Dalarna often goes as Dalecarlia in English, and would certainly have been the name used in 1800. Since Helsinki goes as Helsingfors, which would probably have the English name at the time, I assume it's the name at the time that matters.
Now, as for a more important topic. What I see as the design challenge here is that removing neutrals makes few people have adjacent centres. Stabs must be able to pay of when you do them, and adjacent centres makes this possible. In standard the Turk will have an army in Bulgaria almost always without it being strange, and it can strike at both Russia, Austria and sometimes Italy without delay from there. When centres are not adjacent it's like every power has a France-Italy relation, where a surprise stab is not possible and defeating someone is only doable by brute force alone. Then why stab at all?
Also, Diplomacy is clearly a 1914 game, it just counts from 1901 to make counting easy. A 1805 game, or whatever year, can certainly use 1801 as the start year for counting.