You are looking for simple "OR gate".
And on the input you have the IsPassword and DoNotAllow property.

You should read this: https://learn.microsoft.com/en-us/dotnet/maui/fundamentals/data-binding/multibinding?view=net-maui-9.0

You have example for "AND gate": https://learn.microsoft.com/en-us/dotnet/maui/fundamentals/data-binding/multibinding?view=net-maui-9.0#define-a-imultivalueconverter

You should modify it by returning true inside the cycle, and false on default.

You are not limited to the number of parameters really.