Let me know when you plan to have the meeting, we should come up with a decent proposal, rather than just rocking up and throwing ideas at them.
My thoughts are;
Stage 1: tidy up the lips and berms of the existing track, possibly resurface the track too.
Stage 2: Build a pump track in the bottom corner.
Stage 4: Build a decent size jump line.
That way they can see a plan for a progressive upgrade, starting with a low outlay of funds to clean up existing elements, then building to the more expensive additions.
I think the council will be more accommodating knowing that they don't have to front heaps of cash immediately. It will give them a chance to see the track being used more, and then they may justify the additional expenses.