This would take a full re-work of the friendly system to re-implement all affects on the visiting team. The community asked for that stuff to be removed for a long time. (unwanted/unexpected friendlies causing them to have a weakened team).
The developers would need to write a whole new request system as well. The current interface is too simple to handle anything like this. NORDEUS wouldn't see this as a good way to increase revenue since it would take a lot of development time/money.