They went with polymer for the current handguard for weight savings in the first place so who knows if they will even bother to remedy it through official channels. Might not even register as a priority considering mass procurement of decent gen 3 night vision is still a pipe dream for the PLA. And AFAIK there hasnt been official confirmation on what the material of the DMR's handguard is, though judging from pictures it might be polymer too.
won't require the extent of mods that we've seen in the past to say, modify QBZ95's with rails.
The ACP and Defender longbow didn't require much modification either, the latter of which literally being a one for one replacement for the carrying handle. As opposed to some of the Canadian T97 mods which had them cutting off the front and rear sight posts.
has the PLA adjusted their kit procurement policy regarding outfits procuring alternative from the open market? We know the PAP been doing that for almost a decade, and PLA spec-ops to a certain degree, but overall PLA outfit with such discretion available to them?
It still seems to be more of unit/individual level decision. Best case scenario is companies directly partnering with units and donating samples for evaluation like with kestrel. There's still a lot of backwards and stupid practices that require more structure and guidelines to remedy. For example sometimes the ones purchasing have no idea what they're doing and end up buying cheap garbage (which is how you end up with PAP SOF running plastic replica FAST helmets)
There's also the issue of how they handle deployment specific purchases. Take UN Peacekeeping for example, where most of the time they don't even use what they'll be issued during pre deployment training (up until very very recently they weren't even training with body armor/plates). Look at CHNBATT for UNMISS too, where they introduce the novel (for Chinese industry at the time) body armor/LBV combo, but now 6 years have passed and they still haven't bothered to update it.
It's been a shame because there's a lot of private companies with untapped talent and potential that get overshadowed by the monopoly that state industries hold. Though with the rise of companies like kestrel doing direct contracts and end users demanding better, things might be starting to change for the better.