The hack here is to use some very specific refills and use it inside your cool Rollerball.
For example I use a Signo 307 refill (which is smear, water and tamper proof and specially designed for anti-document signing fraud) inside my special edition Waterman.
The other super cool Rollerball refill is the Pentel Energel. That's as close to an ink pen experience you'll get.
I don't have a very expensive fountain pen, but to me writing feels just as good with the rollerball as it does with the fountain pen. One can feel a difference between the two, but IMO neither is 'better' than the other, and I still enjoy using the rollerball when I have to do so (they are better for extended journeys due to ink capacity, don't leak if you store them up-side-down, have anti-fraud ink, and are airplane safe).
The Vision Elites feel noticeably better to me than the Pilot G2 gel pens which I see many people using.
To Mitsubishi Pencil Co (makers of the Uniball): please make a green ink version!