I'm fully on board with this plan. Sadly I didn't get to work with any of my own research #BeforeModernTimes today. I did, however, recreate the InDesign template for the online journal I work for in Scribus. So now I can do all of the pdf and html production using open source software.
At this point, I haven't seen anyone articulate any limits for the #BeforeModernTimes.
Pedants might point to conventional classifications such as those summarized in https://en.wikipedia.org/wiki/Modern_history
but the motivation was not to constrain discussion overly on the basis of time, discipline, or method.
For my little part, I'd enjoy seeing anything that addresses study of the human past via texts (history), physical things (archaeology), modeling, etc.