The way I read this post is, the keeper must already have very good husbandry.
In my opinion, over many decades working with these kind of snakes. If they are picky, its ALL about the conditions they are kept in. If they are picky, the conditions are poor.
The very first thing a keeper should do is check their husbandry and make sure you're offering what the snake needs(temp choices, humidity choices and security) Normally this will allow 99.99% to feed properly.
In the old days I would wonder why people would resort to tricking a snake to feed, when in my field experience you cannot stop them from feeding. They will naturally feed on anything and everything thats within their prey type and may I add anywhere. This type of feeding responce is what should be expected and used as "normal".
We all know if we dry out adults or get them to hot or to cold, they become picky then stop feeding. Don't we all know that? So why do we resort to trickery with juvi's?
In most cases, small individuals are dehydrated(high surface to mass ratio) therefore, they need more humidity(less air movement) then larger individuals. Of course, temps have to be right. Small snakes also fear everything and rightfully so. So they need to hide and attain the right temps and humidity, while hiding.
With the above conditions provided even the smallest, thayeri, pyro's, alterna, feed readily on pinks. I never had problems, as long as I kept the proper conditions. Of course over the years, I would slip and have to recheck myself, not trick the snakes.
Of course this time of year, folks often have problems because they fail to monitor their temps properly. Most measure air temps, which is not very accurate. Snakes work off off mass temps, not air temps, they could give a flying donut wheel about air temps. In the winter, mass temps normally lag behind air temps, so you have to maintain higher air temps to allow the same mass temps you had in the summer months.
In the field we measure internal body temps. Which is never, the same as air temps. Ok, every once in a while its the same, but the vast majority of the time its above or below the air temps.
So why not make sure your conditions are good, then most likely you would not need to resort to trickery. Merry Christmas