Budget Caps
We all know the big teams will never agree to budget caps for themselves, but how about voluntary budget caps? Teams that adhere to perhaps a $60M budget get certain technical freedoms to help bridge the gap to their better funded competition. Something along the lines of bigger diffusers, increased total fuel allowance, wider front wings. Nothing that visually turns F1 into a 2-tier series, but differences which would narrow the gap from the front to the back of the field.
Revenue Distribution
Abolish the idea of Column 1 and Column 2 teams. Currently about $350M is split between the teams that have finished twice in the top 10 in the last 3 years, change this so the $350M is split between all the teams. And split the other $350M (the prize money) so that even last place gets $10M or so. This would increase the minimum income for a team from 0 to about $40M.
Subsidize the Engines
This would be CVC's contribution. A simple $10M towards the cost for each team that buys its engines. That would exclude Mercedes, Ferrari, McLaren and Red Bull, so not really as expensive as the idea might sound.
Overall, would provide lower budget teams a way to be competitive and dramatically reduce the gap between incoming and outgoing money for the smaller teams, helping them stay out of debt.