For this, army itself has to tell the arde to go in detail for changes in the gun required. But I doubt the user is that much wiser.
The model of putting QRs and just test and choose the weapons that come is as stupid as it gets. User should and must actively participate in the refinement process of said weapons as well, given that user is actually knowledgeable enough to suggest changes.
bhai I'm not sure if you were there back then but under one of my gun post where i suggested possible improvements in one of desi firearms here, probably it was Ghaatak (i suggested it should have top rails and krebs customs styled tactical fire selector etc)
and Kunal Biswas dada made some comments in line that government agencies develop stuff according to RFP and GSQR, not the other way

, some other known and respected gun guy on the forum went by username "ghost" quickly retorted that no way a GSQR mentions that it should have this style of trigger or that style of fire selector, all these are very tunable features and if RFI or GSQR is/are causing such backwardness with red tapism then both parties better stop following it that literally and let the technicians do their job of development with free hand
it ensured lots of flame wars between them like in times where tu tu me me was strictly controlled in forum and eventually someone threw thread ban on "ghost" guy for poking too much, reminder kunal dada used to have mod privilege and was also serving member in armed forces in some capacity so he might have had some biases about lots of things, his insistence about INSAS being good rifle in quite "Nyet, Rifle is Fine" meme way was quite known already
so personally i do lean towards what you suggest here, but somehow babudumbs, both uniformed and civilian ones, aren't letting it happen