My thoughts on this:
Create a unique "Evolve Currency". Players could purchase this currency, for example, by turning in 1 token each of the 5 OG tokens (1 TK, 1 ISD, 1 EK, 1 AM, 1 IG). The evolve currency token, could then be used to purchase items like field ace backpacks, tool chests, disabled homing beacons etc. Id say put the cost of 10 Evolve tokens, for these items. This way players are encouraged to continue to run OG content, but even if they fail during their runs to ever loot the items theyre after, they can obtain it by buying it from a unique vendor.
Traders could also use their trader tokens at a rate of 100:1, to buy the "Evolve Token".
Entertainers could use their entertainer tokens at a rate of 25:1, to buy the "Evolve Token". I came to this ratio based on the fact that entertainers only have a 20% chance to get a token upon buffing a player for a 3hr duration, and then having a lockout before they can get another token. Not an ideal way to farm for the unique token.
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Good ideas.