Op is actually correct, but it's difficult for developers and bm to do so, looking at the funds already put into the project. But if really it can be implemented, then the hunters will decide if to buy the token or stay with reward. And also the team will be rest assured there native token is not dumped by there supposed hunters. It's a good idea by the op, tho few team do this, but will all project team and Bounty managers do this? And save themselves the fear of dump?
If truly a team believes in their own project, they can spare part of the raised funds and pay hunters in USDT, instead of using their tokens, hence they won't blame hunters if they dump when distributed. Some projects have done that in the past like Probit exchange, and it went smoothly. However, it's always a challenge for most team members to do so, they would rather prefer distributing their tokens.