Reverso

I’ve rapped on the petzl purline a bunch. I use a grivel scream and an autoblock and it is great. You could also use a reverso and stuff both strands through one slot and add a second locking carabiner…

I use the petzl reverso and have found it plenty grippy on anything down to the beal gully 7.3. Fresh out of the box it's so grippy actually, that I reverse it when rappelling with 7.5 half routes and fatter. Above 9.2 it actually becomes a pain in the ass to use lol.

Black diamond pilot is a great option for the gym and single pitch sport. Grab a petzl reverso for when you need to start rappelling and belaying from the top. I only use my grigri for route development now. Whatever device you use just keep your hand on the brake strand and they're all safe.

Grigri or a guide mode ATC (e.g. Petzl Reverso, BD ATC Guide, or DMM Pilot). Grigris are the safe, bombproof, and have immaculate quality control. They're the standard assisted braking device for a reason. As you get more advanced, they're also useful for multipitch climbing, self-rescue, and rappel

A reverso works fine for a rad line, even for a rap. Petzl even explicitly states so, as long as you can introduce additional friction.

I would disagree with your assertion that grigris are safer than ATCs for the scenario you described. Backed up with a friction hitch, an ATC is quite safe since the friction hitch will keep the device engaged—even more so if you tie off with a MMO or tie a cat knot below the device. If you extend y