Excellent ideas! I was thinking of a virtual 4 bar myself so it could go 180. I was also thinking of having a larger contact area with the carousel, maybe through multiple small wheels, or like you suggested a curved belt. The only thing I want to point out is you are not allowed to move around the goals, so you cant add those servos to drag them around. Other than that great video!
Thanks for the comment! Yeah RIP moving the goals. Based on the recently released RI3D and RI30H protypes, I think slides will likely be one of the metas this year. A V4B could work, but based on previous games, I think slides will end up being faster.