Unfortunately, white pine weevils will fly to the leader.  I think exclusion will be difficult to achieve.  Pruning or chemical control are your most reliable options.  How tall are these trees?  If you can easily reach the top, a single, well-timed spray (or even application with a paint brush) to the leader down to the first whorl is likely to provide control.  You don't need a soil drench or to spray the whole tree.  Just apply product to the leader and the section of trunk just below the leader.  You do need to use the appropriate, registered product at the correct rate and properly timed, but white pine weevil is not difficult to control on smaller trees.

For more information: Control of white pine weevil.

I have not heard of white pine weevil resistance to those products, and any of them should be effective.  It never hurts to rotate, but that is more of an issue for growers who apply the product frequently, and there really is no reason for you to store multiple products that will be infrequently used. Apply the product between 25 and 65 growing degree days (GDD) (base 50 F), which is probably around mid-April for you. To get the best control, follow up with a second application 2 weeks later. 

Current GDD can be found on Enviroweather.  Select Weather > Maps: Growing Degree-Days (50). Then change the default settings on the right to "Cumulative GDD (50F) With Values. Locate the closest station (dot) to you on the map, and zoom in to see the current GDD value.

Glad to hear it!  Let us know if you have more questions.