The solution from Seghierkhaled is a good one. The only modification I would suggest is a different sorting method at the end.
When I tested it (using different settings) I got two curves. If you sort using the method highlighted below, you are guaranteed to only get one.
I like this solution, but if you are looking to get as close as possible to a target value, I would probably still go with Galapagos. The downside is that you do have to rerun it (double click on the solver, go to the Solver tab, and click Start Solvers) every time if you do change the curve.
The first step it the same, first you should play with a slider to find the range where the area is within your target goal, then double click the Galapagos slider to set it within that range. That way the solver doesnt have so many options it needs to try and will solve faster.
See both options in the file attached, including the alternate filter option for the solution from Seghierkhaled.
26 FEB 2019 - AREA_V3.gh (16.3 KB)