Pretty much all of what you have suggested already exists.
of many pistol grip alternatives
magazines in a full size mag body.
that turn detachable magazines into fixed magazines.
California/1994AWB already caused these things to exist.
A lot has happened since the last AWB and the liberals won't make the same mistakes this time around.
The above is important to note. Feinstein's new bill makes it harder to work around the features issue, and internally in CA they're already trying to rework the laws so bullet buttons aren't considered fixed magazines anymore.