I like the token concept since you feel like you are making progress.
The RNG that the game uses is the Unix/Linux system call. You can take steps to make it less predictable, but you can not make it favor or disfavor any specific character. On live the first collection holocron I looted was one of the Ultra rare ones. Another was the last and I made ATK farming bearable by saying it was a race to see if I looted one, or if I made enough from the credits and junk loot to buy one from a scalper.
So I would not mess with the loot table and would add an additional completion token that all get. That way if the RNG favors them they have the item that way, but if they run it often enough they can buy it with tokens.
Also, if you can spend X trader tokens to get 1 of these tokens you should be able to spend 1 of these tokens and get the same X trader tokens, Y entertainer tokens or Z heroic tokens. It should not be a one way street and the conversion should not be done at a loss.
As to the conversion rates they should not be too high or too low. I reserve my opinion on this this till I see what is on the vendor and the prices.
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