How about some new Iron Banner bounties, for example...
Shield of Iron-- "Stand together Guardians"....Defend 10 players. Standard 100 and 5k rewards.
Apex Predators (or maybe War Party)-- "Show them what a hunting party can really do"....Win 5 Matches in a row, must have fire team of at least 3 people... get 200 rep and 10000 xp
Iron Primary -- "True warriors only need one weapon"....Get 15 kills using only primary weapons. Kills with ANY other weapon type resets your progress, including heavy. Rep =150 xp = 6500
Iron Fist -- Get 15 melee kills etc (same as Iron Primary)
Iron Statute-- "Stand tall Guardian, forever"....Earn "The Best Around" medal 5 times rep=100 xp=5000
I realize you are changing the way xp works with TTK and since I don't know that system yet I've used the current xp and rep values for reference examples.
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Bump, nice bounties, don't really dig the reset for killing with another weapon. But it's a start. The stand together bounty and win 5 matches are great though.