I think you'll have to create some sort of bounty program as forum signatures are valuable real estate and people like to monetize them as much as possible.
Something like:
1. keep the signature for a month (15/11 - 15/12)
2. make at least 5 constructive posts per week in diff threads
3. Posts such as "hello", "good luck", "love this project", or any other unsubstantial posts will not be counted as valid.
4. Posts with less than 60 characters will not be counted as valid posts.
5. Participants with red trust score will not be accepted.
Bounty Amount:
Jr Member: 1000 coins, term deposited for 1 month
Member: 2000 coins, term deposited for 1 month
Sr Member: 5000 coins, term deposited for 1 month
Hero/ Legendary: 10000 coins, term deposited for 1 month
Ask folks to register via a Google form or something where they can also track their contributions. Maybe also get bounties for blog posts and social media campaigns - they definitely create a lot more visibility and lead to credibility when people Google about the coin. It's interesting stuff
P.S. Happy to accept contributions from the community if I helped! I believe in the coin and imagine it reaching wider audience. I'm not delusional as those in Electroneum or eBTC threads that it'll replace BTC or ETH or even BCH but it can certainly have a niche of it's own and command a decent valuation!
So, is the above info live, or just proposal by you to dev?
The official bounty announcement is here: https://bitcointalksearch.org/topic/m.24543675