Starting out as an alternative scenario, you may Buy from host your possessions (simulating attrition) as if you can rise your influence and civilization anywhere and later on new civilizations may emerge in between.

There are 4 new types of declarations, adding flexibility to new strategies deciding whether you want to surprise your enemies Must state your type of declaration. And the normal War declaration may be made in pairs because it is expensive going alone (Economy, simulating secret alliances unfolded). Not all types of declarations must to be warned so be careful and defend your lines (Strategy) as the greater extends you have the greater the garrisons you’ll need to defend (simulating attrition).

There are Border Events you may leverage from, fomenting diplomacy and interactions among players (as if it was uprising or independent movements) and rising Morale from winning a conflict will grant you 60% return of loses (fomenting interactions) whilst low morale from losing a conflict only 30% returns (Forced peace not to erase the players). Adding a cost for each territory you conquer as its cost for controlling (simulating attrition) might make not starting a conflict more viable. As if it was alleviating costs everyone gets returns whether they win or lose for peace (incentive players not to grudge over someone).

Eventually the powers of the continent may travel to form the trade networks and increase their influence around the world, starting a new Game linked to this game, deciding how would you like to move your riches between the 2 games at a cost of real things attrition the host will give you all your arrived riches. To speed up things compared to normal diplomacy there be Multi attack allowed at max 2 lands away (as If it was 2 turn movement in 1 turn) making the phase of the game more entertaining and adding depth in strategize 2 lands in depth.

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Do you have a game link?

It’s a concept. By the way I came up with a conclusion:

In conclusion this game try to simulate the costs of your nation, thats why might be better not to enter in conflict if you not have the money to afford it, giving returns overall makes the game more tolerable to frustration (no one likes to loose its assets) and you may need to consider saving gold. The double move it is to make the game more strategic

You might want to elaborate how you intend to display these features within Warzone game mechanics