no, it's not a modified AMX.
I admit this one is extremely hard. Few people will ever have seen this aircraft (AFAIK it's only been shown on 2 or 3 airshows ever, and is not in operational use anywhere at the moment).
Gotcha in my sights now - M-346 Advanced Fighter Trainer, Italy
The M-15 Belphagor is so cool - a jet powered biplane. Now, if you think that's a lead in to a Polish joke, keep in mind that most of them were sold to the USSR. The Poles use a conventional prop plane as the mainstay cropduster - better performance, lower cost.