The difference between ay 4th and edo minato is actually quite wide on gameplay terms.

Ay 4th fragments cannot be easy farmed in any way besides p2w events while edo minato fragments appear in a lot of events redeemable for coupons.

So is very very possible that if you begin to hoard coupons now that you are able in 1 year to get him with the 3 sbs you talk about overall if luck blessed you and you gained once 80 frags from the lucky stars wheel.

But you will still be nowhere close to make ay 4th viable in the same amount of time, even if you used all your ss in kage treasure.