You can't shield-cancel any of the moves during charge anymore. At the best from what I've tried, your options are...
Before release:
- Jump while charging a grounded side/down-B. The Side-B will continue to charge (has no hitbox, but you can release it for iframe counter or momentum override), Down-B will put you into the spindash jump (has a light damage hitbox).
- Spinshot (technically after releasing Side-B though)
After release:
- Double jump and wavedash downwards just before either side/down-b hit the ground (or during hitstun if you land the attack). Obviously, doesn't work if you don't have your jump.
- Low-charge/speed side/downB can unroll once you hit shield.
As far as Homing Attack goes, you can just change the release timing for it and nothing else afaik.
I probably should make a separate thread if I ever get around to posting the video but I pulled off some weird non-rising / grounded homing attack (!). I haven't been able to do it again since the replay though :/