I have no experience with Rocna, but I doubt it (or any properly sized new generation anchor) will fit in the locker. Nor will the CD anchor roller carry any style anchor sized appropriately for a place like SF bay, in my opinion. I tried.
I went down this road with Mantus, nine years ago. I had to settle for a 13lb model. I wanted 17, but there was simply no way. Happily, the #13 has been 100% effective.
The only way I found to mount a "real" anchor on the bow was to buy
this anchor roller from CD and modify it to fit. Even then, I had to cut out a small section of the anchor locker hatch so it could close over the anchor shank.
It was all a
monstrous pain in the butt, expensive and time consuming. It was also the single best thing I ever did to make Daydream a better boat.