As I understand the demands for work with secure tokens are more strict the for the work with utility tokens. It is good that before go on the exchange you will be working with either a Jamaican and/or Barbados Broker-Dealer. They have a big data of investors and more chance for conduction successful STO.
How will the project tokens be distributed after open sales?
Same way they are now. The are minted within 24 hours of receiving a verified investment.
Once they are on the secondary market after the STO, then they are distributed like any exchange would.