pls don't make any difference in token loots or plates required. Your current system is very good.
Thing I can see many of non plate users will do offers now cos if u took out few countries then majority of people got only 2-5-7 plates form those offers which pay plates "sometimes". Collecting 15 plates for single opening mskes them hopeless and they quit for offers. But now with low drop rates ( imagine drop rate of watch lock divided by 2-4 cos of normal crate not massive , lol its gonna be a lol or troll) they will get some activity in locks keeping lock rates high and better game economics . It won't make any big difference for arcane or mythic.