That might work, and as mentioned, if it doesn't, then nothing lost.
However, if you're going to go to the trouble of making a template, you might as well try moulding a new scoop.
Make a pattern (of the front of the scoop, about the same overall size as the kit part) out of 'solid' balsa, and include a 'handle' with which to grip it, seal the grain with the varnish / talc mix and, when set, give it a couple of coats of gloss varnish, in order to have a smooth, glass-like finish.
Make this pattern very slightly smaller than the required finished part, to allow for the thickness of the plastic to be used for the moulded part.
Using the pattern as an outline guide, draw the shape onto a sheet of fairly thick balsa, and cut out this shape to make a female mould. This will need to be made so that the front end of the scoop pattern can be pushed through the hole easily, to form the basic shape of the 'chin' of the scoop.
Now firmly fasten a sheet of plastic card onto the balsa sheet former, and gently heat this under a cooker grill, or over a hob, until the plastic becomes soft and slightly floppy. Move the balsa sheet in a circular motion whilst heating, keeping it around four to six inches from the heat source.
Then quickly push the balsa block pattern through the plastic over the female mould, in one, smooth action, which will form and set rapidly, and then withdraw the scoop pattern.
Remove the moulded plastic from the balsa sheet, and trim to the required shape, taking care when cutting to create the open 'mouth' of the scoop intake.
You should now have the basic shape of the front of the scoop, which can be trimmed to fit the fuselage, and the required curves of the lip can be created with Milliput and blended-in.
It will probably take two or three attempts to get the required part, but you may be lucky first time. I've been using this technique for nearly fifty years, and I guess practice helps, but I normally get it right within one to three attempts.
The pics below show the moulds, carved from balsa, and the clear sheet used to mould a 1/32nd scale Mosquito canopy, which is roughly the same size as your scoop in 1/24th scale.
However, if you are unable to make one successfully, then it might be an idea to try the suggestion I made earlier.