One G rolls: a physicist's view

Vertical airspeed of 300 hundred feet per second? That is a whopping
18,000 feet per minute! Typical airplane decent is less than 2000 feet
per minute. Also 18,000 feet per second is 180 knots. I dunno..... I
can assure you that it's not normally done this way.

You can maintain I G into the seat with a coordinated banking and
decending flight path. Someone else pointed out if the airplane were
allowed to free fall with gravity a coordinated roll pulling back hard
enough to maintain 1 G into the seat (local upward acceleration of 32
fps^2) does the trick. You have to agree if you bank an airplane and
keep the ball centered there's no left or right G force, it's all into
the seat. If you bank and decend, you can make that force 1 G.

I think the OP ran the numbers to demonstrate that.