I really like that and tried something similar in in PFF's simulator.
I'd rather go WR or TE with the 3rd pick though and pick up a promising CB later, but, I confess, I don't value CB very much so that's probably just me.
I would say my draft crush is Greg Newsome, CB, Northwestern. He's fast, athletic, a great player, well coached, and never out of position. 6'1 190, perfect scheme fit for us. Ballard visited his pro day and loves him. Great RAS. Great combine. He can even defend the run. My favorite CB in the draft. Take a look at him if you haven't already.
I'm thinking the Chiefs or Packers would do it. Packers could go after Newsome, Farley, Toney, or Bateman at 21. Chiefs could go after an O-Lineman at 21. Especially if Teven Jenkins made it to us. I'd hate to lose him, but he's more of a RT anyway, so I'd trade down in a heartbeat to get a 3rd. Might even get a day 3 pick next year as well from the Chiefs.
We aren't trading Wentz, like at all. The 49ers definitely aren't trading the 3rd overall pick for Wentz after trading three 1sts and a 3rd to move up from 12 to 3 to get that pick. They want a QB there. Whether it be Fields, Lance, or Mac Jones, and they will get him.
BTW, I love your Meta Knight picture. Used to be a big Kirby fan.