Avatars plugin transition

Hi, I’ve been using a wp repository that is no longer maintained called Avatars by Peter Sterling. It has continued to function through various WP version upgrades. I also use the Author Avatars List plugin. However, I’m trying to improve the accessibility of my website and WCAG compliance. I’m trying to stomp on accessibility bugs created by certain plugins. Alt text features prominently in this effort. All my avatars are displaying the same alt text of “avatar.” This is showing up on testers as issue. I’m thinking of transferring to the WPMU Dev Avatars plugin. I have several questions:

1) All my avatars are located in https:disappointed:domainname.com/avatars. Can you plugin access the avatars there or do I need to transfer them one by one?

2) Can I assign a my own unique alt text for each image?