I have almost completed this task. I acquired my first piece of LL 400 gear today from a strike bounty. I am almost there. I can do this. I went up 3 LL. The grind is almost complete.
And I have done this without doing a single trials of osiris or raid ever.
(also, I have a suspicion that the strike elite gear can get you tier 12 stats)
Just sharing how my day went.
EDIT: I'm required to say I'm trending. .-. Hey top of the list! ;)
EDIT AGAIN: Also making a community defender montage, see this:
https://www.bungie.net/en/Forums/Post/221417812
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Same here, felt like it took a long time, but once there, 400 gear and weapons seem to drop all over the place. SRL definitely gave me a push in the right direction, and IB just gave me a few more loadout options.