Thanks for the support, guys!
Don't worry, Paw, I already managed to sort the appearances in chronological order. All I had to do was to use Grand Comics Database and compare the cover dates and the on-sale dates of the 3 different series (Mystery Men Comics, Blue Beetle and Big 3) in order to understand the publishing order.
As for the Charlton appearances, I'm just counting in the pre-reboot ones (1954-1956). When Charlton bought the rights for Blue Beetle, they started publishing the character just like he was at Fox and Holyoke, without changing his backstory. This was during the 1954 "revival" of superheroes (it happened with Sub-Mariner, Human Torch and Captain America too).
10 years later, in 1964, they will rewrite the Dan Garrett character completely, by making him an archaeologist and by giving him a magical blue beetle amulet that grants him superpowers, and this is the proper pre-Ditko period I think you were referring to. In fact in 1966 Ditko will create a new Blue Beetle (Ted Kord), as the successor of this new archaeologist Dan Garrett.
I think I'll leave this other Blue Beetle (archaeologist Dan) outside of this compilation because his appearances are pretty easy to follow (he only appeared in his own series, Blue Beetle) and he's an entirely different character than the Golden Age one (policeman Dan).