Here is my sheet that is mainly used for rebalancing ETFs according to some simple rules. It is currency agnostic (base currency can be changed) and should work fine for European investors as well.

It automatically pulls MSCI market cap information and determines the allocation based on that.

Then the number of shares that you need to buy or sell is calculated based on the target allocation.

If you use Interactive Brokers, then buy and sell texts for the IBOT are also generated.

https://docs.google.com/spreadsheets/d/1yJSF7tBZpJPvRf7tja-7...