No offense, but a horrible student can make any classes a poor learning experience, and make the instructor miserable. Doesn't matter if it's EMT, ACLS, CPR, whatever. And as the instructor, the fact that they don't want to be there or that their employer is forcing them to be in class isn't my issue; I have no problem booting someone from my class for being disruptive, nor do I have an issue calling their supervisor and explaining that being disruptive in my class is unacceptable.
PHTLS is 80% BLS and maybe 20% ALS.... maybe closer to 10%.....
ACLS is 80% ALS and 20% BLS..... maybe closer to 10%....
Can an EMT take the class? sure. Can they pass it? well, I did.... It isn't rocket science, but the real question is what benefit does it give to the EMT? more knowledge sure, but they can't do anything with it. If they are a paramedic helper on an ambulance they can help out their paramedic, but that's about it.