Suppression could also be done with all the other delivery platforms listed. The choice challenge would then be cost per unit 'suppression' - for want of a better term.[Mod Edit: Please be aware that you are responding to a post by a Defense Professional, in a manner that demonstrates a lack of understanding of what has been posted. Kindly note that you are on the wrong channel and we have provided some guidance, as you seem to have a real interest in learning more. Try and read up on the concept of artillery suppression in the context of manoeuvre warfare before posting, it would improve the quality and relevance of your reply.]
Agreed, using JSF for this role won't be smart, but what if Big-Dumb-Boosters concept here?
i.e.: hundreads of so-called vintage tech jets like F-5/F-20(start making them again), rockets/missiles, for exactly the same purpose.
Let's invoke the genius of Henry Ford in mass production, and reap the benefit of economy of scale.
While waiting for rail gun to be made battlefield ready, wouldn't it be a lot easier to field Paris/HARP type superguns, (at least the Paris gun is battle proven, and we also know HARP worked well), given the availability of affordable production facilities. Big-Dumb-Boosters get the job done too. [Mod Edit: While we want to encourage participation and provide some guidance, do bother to read up on the basics before posting, or you will not last long in this forum, when others point out the obvious in a more direct manner.]