The storm grille according to link below is made in Brazil as a special 'Storm Ecosport' model built there in the Brazilian factory in 2018, for the Brazilian market only.
Not sure how you would get one, unless you contact a Ford Brazil parts department, and get a price for the item, shipping costs and import taxes. Assuming that they would even consider selling it to you as an overseas customer. Also would it clip on easily to the UK Ecosport with the same pattern of fixings? You would think yes, but it is still questionable.
Being thinking all night about this, OK, if truth be told, it was a few minutes thinking and a lot of drinking LOL
As the grille is almost identical to the UK one, but without the storm label.
Why not get a 3D printing company to print out the Storm label in black plastic for you, based on using photos as a template, and fix it on your grille, and just move the Ford badge up a bit as photo.
It could not be any dearer than getting a genuine one bought, shipped and taxes. Could it?