FCPS can;
> roll back early start times
> eliminate full day pre-K
> limit ESOL to 3 yrs (any kid is going to pick up english in three years)
> right size Special Ed programs
and in a perfect world;
> eliminate football
> reduce all psychologist, social worker and consultant expenditures by at least 1/3rd
oh, and spend locally (the GMU economic study reported that 50% of all FCPS expenditures are made out of County...
and finally; hire a lot more teachers who are in the classroom teaching.
The requirements of State and Federal law are relatively insignificant. The real driver for reform is that educated children are the future work force and will determine whether we attract and retain businesses/jobs and improve our Quality of Life. Squandering resources on education (or anything else) puts that bright future at risk. IMHO, we are at the point where FCPS is stressed to the point that many children are not well educated (71% can't pass the 5 SOLS - not a high bar). And the taxpayers are clamoring against more indiscriminate spending.
We have a bar-bell distribution in FCPS; entitlement seeking special ed parents and entitlement seeking high performers (think TJ, AP, Immersion, IB etc), and these are enabled by special interests that feed on their "needs" (aka: wants). The "typical" students in the middle gets squeezed into more crowded classrooms with fewer teachers and resources. But these are the kids that will choose to stay here (or not) and do the work that pays the taxes. We need to do analysis of the ROI of both those bar-bell constituencies and see if they actually earn a return. Unfortunately, they are the poster children for politically connected parents and for the emotional appeals that mobilize the voters... it will take a concerted effort on the part of academia (GMU, TJ Institute etc.), the private sector, HOAs and citizen action groups to organize with sympathetic elected officials (Hough, Schultz, Herrity etc.) and their advisors (e.g. Ed Long) to develop a coordinated, data based, analytically rigorous vision of the most efficient way to provide education to all children. This is not a small undertaking, but sharing perspectives (as you have encouraged) and data is a first step.
P.S. Have you seen the FCPS Office of Program Evaluation? Seven professionals who evaluate programs and publish the results. It's a start in the right direction.
https://www.fcps.edu/department/office-program-evaluation