Hey Andi,
I agree with Jacpin. As you know, I am for diversifying the risk as much as possible. I would not go below 3 EAs for each asset. If you are worried about the money management, just reduce the trading lots.
For example, lets say you want to trade 10 EAs with different assets with 0.1, so totally you will have 1 complete lot. Take the EURUSD. Instead of having one EA with 0.1, you can have 3 different EAs with 0.03. Totally you will have 33 EAs for the same 10 assets with the same money management(even better). Or go for two as Jacpin says, than to 3 and so on.
But if you start only with one asset, and you will have some losing EAs from those, you will need to eliminate the currency pair from your trading portfolio, which I believe is not the idea of having 10 different currencies.
Cheers,