I'm wondering, are there any other planned or existing crypto, other than hex, with incentives to "lock" coins, thereby reducing selling pressure?
What you need to visit this site.
https://www.stakingrewards.com/There are bunch of POS coins that was offering the incentive for the long term holders. You can also take a look at some decentralized exchange site like pancake swap as well.
He is only offering staking reward but this project didn't have what we have called that as product. You can also take a look at sovryn