The way to connect funding to Open EdTech is to help government entities understand that funding open educational resources which are used on open source learning management systems and are archived or stored on open access repositories which are funded by consortia of governments can be accomplished by diverting money already being spent. It doesn't require spending new or more money and could likely result in saving money. All parts of Open EdTech will need funding but we are currently spending something like $60 Billion US per year on educational material. If my math is correct, !% of that number would be $600 million US. That's still a lot of money.
The problem is that no government entity anywhere in the world is famous for doing things innovatively. It is likely that we'll need private philanthropic sources partnering with for profit companies to demonstrate to governments the benefits they will realize by diverting money currently being spent on proprietary content being delivered on proprietary platforms to publicly owned openly licensed content on open source platforms.
Openly licensed content (OER) is beginning to show cost saving results in U.S. higher ed (where the funding goes through individual students but is still largely supported by government funding.) But, the homework systems associated with the OER are still mostly being done with proprietary platforms on a fee per course basis. $20 per student per course is common in U.S. higher ed for homework systems - systems that could be improved if they were delivered via Moodle instead. There is opportunity for open EdTech to make a difference in this area as well as in all of the other areas of education.