If they are going to use WAGR, I think the fairest way would be to have the top-75 ranked Americans and the top-25 ranked internationals. WAGR is grossly unfavorable to US juniors when it comes to points allocation to bigger junior events compared to the point values in many countries. I have no problem letting top international juniors in, and they should be welcomed into the championship. There just needs to be a more equitable way of doing it. My son always thought it was cool meeting kids from other countries.
Top invitationals/tournaments outside of the AJGA:
Tier 1: Junior Invitational (Sage Valley)
US Junior, Junior PGA Champ, Western Junior, Dustin Johnson, Jones Cup
Tier 2: Scott Robertson, Bobby Chapman, Elite Invitational, Southern Junior, North & South, IMG
probably forgetting some