If new competitors are being deterred based on the perception that the sport is expensive to get into because they need a 5k "space gun" one solution would be to have a class specifically with equipment limitations. Trigger weight, barrel length, max magnification for the stages, no muzzle breaks, 5.56 chamber, limit on bullet weight etc, etc, etc.. Maybe call it "Service Equivalent"
I recall one match where a competitor was lamenting it was not fair because I had a magnified optic and he had an Eotech. Well my Falcon Menace scope cost less than his Eotech so it was hard to feel bad for him because he made a poor equipment choice for SR, but if I was using a 3-12 March it would be pretty hard for me to argue a significant equipment advantage with a lot of $$$ required for him to catch up.
If competitors want to get in for "cheap" they shoot this class. If other competitors want an option to shoot more advanced rifles, they compete in say "Open" where the sky is the limit. As many shooters evolve and gain experience they naturally want to shoot higher performance rifles and the AR platform lends itself well to incremental upgrades to achieve this.
Now, does any of this assist with marksmanship training for the military. Maybe in the sense that more civilians involved, more matches at the PRA level and more competition opportunities for units and/or individual CF members. Not sure about that though.
Does having more civilians involved in the sport assist civilian gun owners in demonstrating the sport is legitimate and MSRs are not an evil thing that need to be banned? Yeah, probably. Which is good for all of us, civilian and military alike I think. Most military members were civilians at one time (I can think of a couple I know that I'm not so sure about

) and will be again after their career. Those that competed on military teams would probably like to continue to do so. Again, growth and continuation of the sport is necessary for them to do so.
Of course now you have another class in the competition, more awards, more logistics, etc, etc, etc. That is an obvious down side. I'm not a match director and those that I know of are volunteers so it is hard for me to say they have to make this change and add more work to what they do.