My recommendation is RTS camera in custom battle. This mod has an exchange of team function among others. If you order a team to " stop" and then you change characters/teams you will be able to act freely without the enemy attacking you (if you don't get too close)
Are you going to practice with the new face enemy command, right? Watch the training ...
In custom battle put enemy troop number to 1, and he/she wont come near you, but will hide on a hill and wait while you do you thing.
The best we can do for now