Not only is this strategy unfair, it often backfires.
While you can't order them to like your new boyfriend, you can insist that they treat him with respect while everyone works through the transition.
If, on the other hand, they end up not liking him, then your boyfriend can become a wedge between you and your kids, and that creates tension for everyone.
Protect your kids and your home life by holding off on the introduction until you're sure it's worth the upheaval it has the potential to cause.
You won't like every thing about his kids, and they won't like every single thing about you.
But you will both be able to trust that your opinions are honest and the developing relationship is genuine. Make sure you don't let your new boyfriend approach your kids like they are Oscars that can be won if his performance is impressive enough.