I didnt even think about saving haha, i decided to give it a try and it does allow you to. When reloaded you will still have an empty team. However now if i add a team card, the leader will be Level "100" and editing the team to view the invisible partner or anyone you add behind the lead will be displayed as Level 100 MWMWMWMWMWs.
(i had an image showing it here but unfortunately Itch's image verification failed)
As expected though, attempting to expedition like this, edit the MWs etc. Will lead to the same previous soft locks. (too bad, i would have loved to do a match with my level 20 100 :3) The fix still just being to close the game or add your own monsters and not a team card c: