Remember that the perfect is the enemy of the good. If you create a text FA, you can always print it out for on-site and reference use. Create a PDF, and you can always go back and mark up the text file for better access. If server space is an issue, look at Google Drive to post them. It’s fairly stable, and you can link to them from wherever. Or post them everywhere. EAD, like MARC, was created in the Olden Tymes when computer memory was small and expensive (my first pc ran on DOS and had a 256 byte hard drive, and cost 1200, and yes, the dinosaurs did have bad breath), so while XML is great, EAD may be past its prime. Once you have the info entered in a text form, you can migrate it to any number of systems later.