Though I understand the feeling of the desaster (and have such myself with some minis from time to time) it does not look sooo bad after all! After some experiments at the underside - and depending at the outcome - I would leave it at that and use it as some "old worn out" helicopter, often in use in dessert campaigns. It might turn out as an eyecatcher!
Half of the weathering is already done, without buying any pigments at all. Even the channels might be useful for chipped-of color.
And if You do some camouflage-nets over it, most of it won't be seen anyway. So, everythings possible, still!
However, bad hair day with primer is one of the worst things in this hobby!

But be glad, though, it does not happen with the finish!

best wishes
DK