I believe the CHL scholarship can only be used at a Canadian school.
Not to mention using that scholarship to play at a D3 school would be against D3 rules. Now that I think about it, perhaps that is why the NCAA said CHL players still can’t play D3.
I didn't look at all three leagues... but the WHL does not seem to have a Canadian school restriction:
https://chl.ca/whl/whlscholarship/
"A player is able to attend any post-secondary or career-enhancing institution of his choice, including universities, colleges, technical institutes, trade schools, or any other institution which will help the player achieve his academic and career goals."
"Each year, more than 375 WHL graduate players attend post-secondary institutions on full WHL Scholarships at over 80 different institutions across North America."
If it was only Canada, I suspect that statement would say across Canada, not North America. Also, I am pretty sure that the NCAA institution schools cannot offer the scholarships, but I don't think that there are really any restrictions on who can offer a scholarship to pay a student's tuition.. especially when that scholarship is not contingent on that student playing hockey at that institution... essentially what you're saying is that no D3 athlete is eligible for any scholarship by a 3rd party organization, which I am pretty sure is not true... no doubt that there are probably rules for trying to manipulate scholarships, but this does not seem to be the case as these scholarships are not offered to attend certain schools..