For general wallet it's 2-8 in GUI, 2-16 in cmd-line, 2 by default.
For liquidity providers - 99999.
Btw, we are slightly off topic :wink:
It feel like you are trying to make it complex when there is no need to :tongue: You can just send mixed funds to some address, provide txid of this transfer and ask to find a non-denominated source of these funds.
As for DS issues - I think there are still few things I'd like to improve/change in DS to be even more confident, I would wait with bounties like that a bit.