Wild Genetic Boosting

[Bogertophis]

...perhaps there is something like this the prey item could be dusted in prior to feeding?

I wouldn't bother "dusting" on the prey- by the time it's swallowed, most has fallen off. That's also assuming that the snake is still willing to eat it when it smells slightly different.

As stated in previous post by paulh, inject (if it's a liquid) into the prey's body, or pack the powder into the rodent's mouth-that's what I do. Whatever you do though, don't over-do it.