There is actually one more (potentially risky) way for Yuzuru to truly maximise his jump base value with his current jumps...learn a +3Lo combo. Unfortunately, it would require a 3F-3Lo, and we know how much he (used to?) dislike(s) the 3F. If he could do that, he could then do
4Lo
4S
3F-3Lo
4T-3T
4T
3A-Eu-3S
3A
However, I don't think he could do this if he wanted to add a 4A. In that event, he would either need a 3A-3Lo (honestly harder than a 3F-3Lo even for him), do only one 3A, do a 3A sequence, do a double (which isn't normally worth it), or drop a quad (possibly if he doesn't want to do 5 quads).
I don't know if Yuzuru has any sentimental value attached to his 4T-3A tbh, but for sure, he's the only one capable of such a sequence right now.
Is it really easier to do a -3A sequence compared to a -3T combination though? Most skaters still have trouble doing a 3A, full stop, let alone after a jump that slows down your momentum and potentially destabilises you. I hope ISU changes this rule too.
And please raise the BV of a 4A. 12.5 points for a 4A is a joke. The reward for a 2A over a 2Lz is 1.2 points, more than the 1 point reward for doing a 4A over a 4Lz.
Stay healthy, Yuzuru!