One thing is: you didn’t acquire the book to burn it.
Think about the logic of that for a moment, especially for a Christian commission (in Scripture) whose avowed job is to proclaim the Gospel?
Buying a book to burn it is a waste of limited resources that could be applied to proclaiming that Gospel TO Muslims.
It is also an action that seems much more likely in that context to harden the hearts of those in Islam to that same Gospel.
Overall it is simply a dumb maneuver. And that’s neglecting the fact that you’re paying someone to print the book you are going to burn.
Now, if someone escaping Islam burned their Koran as a symbol of breaking their bondage, that’s different because of 1) intent and 2) the lack of a commercial aspect too in such a case that is actually no different than converted disciples in the Acts burning their scrolls of magic.
Likewise what you suggest is different: if only because it doesn’t represent a waste of resources to destroy something already in your possession.
That’s taking logic a little too far. Too many false assumptions for me to respond adequately. Do you understand my tagline, however?