Hi,
There is no great answer. You can do some automation but that can cause issues.
What you need to do, going forward, is create a Service Account. All that is, is a real account named something that can be shared across all the devs and support. Having people, in any business, Dev or Not, use their own is absolutely going to cause you to fail over and over.
As for doing it quickly thats not a thing really.
Also, what is just as important, is
1) make sure your flows are in Solutions
2) make sure you are using Connection References NOT connections. If you had used Connection References, this would have been way easier.