Yes, suppressed rifles can be hearing safe, so long as you get the right can for your needs. Some of the more compact cans will not be hearing safe on shorter barrels (especially SBRs), but may be hearing safe on long barreled weapons.
Last I dug into the NFATracker data, there wasn't much (if any) difference in a trust vs an individual purchase. eFiling for Form 3 and 4 is still down, so you will have to go paper either way.
As for cans, I purchased an SDN-6 and finally got to bring it home a few weeks ago after a 9 month wait. While there have been people here on the Hide that had negative experiences, mine has been absolutely positive. It's hearing safe on both my 20" 308 bolt gun and my 10.5" SBR'd AR-15 in 5.56. The can did have a little rotational wobble when I first got it, but now that the brakes I use have gotten a little dirty all the play is gone, and the lockup is dead nuts consistent. Accuracy in my 700 hasn't been affected (it might even be a bit better), and I'm getting about 25 FPS extra velocity. The biggest improvement for me, though, was the recoil impulse. My 700 now has almost 0 vertical jump in recoil, and what little recoil is left with the can installed is straight back. It's made life MUCH easier when it comes to engaging moving targets and correcting for lead mistakes, wind, or elevation.