If you do that, why not cast the weed guard in and not use the pins at all?? The pins are so you can power paint and cure first, then glue the weed guard in after, if you glue it in and use the tubes you may as well cast the jig with the weed guard in.
I tried and I've had too many weed guards fall out from simply casting them in the jig... I can only recall this happening once with my glued in guards and I likely missed something on that jig to not have it properly bond.
The other problem I have also experienced with trying to cast jigs with weed guards already in them is that sometimes a single strand from a weed guard will prevent the mold from closing tightly and the cast is essentially wasted (many times along with the weed guard).
I've also drilled like Lamar does, but found my current method is overall more efficient for me.
Given you and Denny both chimed in as you did with the Teflon pins, I'll definitely want to try them in the future.