Another idea is have a certain amount of units able to enter Switzerland like 4(or something else) or have only infantry(maybe artillery) able to enter.(since of the mountains)
Another problem for me is that Serbia’s army is 4 units and thats annoying because for how much Serbia did for the allies. But Albania also has 4 units and Albania didn’t do very much so my house rule is…
Serbia is worth 3 and every round it survives it gains a free infantry.(this makes sure that AH doesn’t only send a few units)
Albania is worth 1 and is strict neutral.
I’m also wondering if Bulgaria should gain a free infantry every round when it is activated.