I use Vittoria airliners (tire liners for road bikes) in my gravel bike, which I also commute on so I like being able to ride it even if it goes flat. Used it on a road bike but the better tubeless tires with puncture protection like the GP5000s are mostly so good that I don't bother anymore. The tire liners absolutely work and are ridable; a flat front tire is a bit sketchy. Vittoria claims they work as run-flats up to 50km and that's exactly what I got on a torn sidewall once before the tire liner disintegrated inside the tire and I had to get on a bus (I wasn't nursing it, was doing a constant 200W).
When the tire still holds a little air, it's pretty OK to ride on them. Rode a few times back home 20-30km on them when I was experimenting with TT tires without any flat protection on a road bike (doesn't quite work well) where the tire would hold a bit of air. They make removing tires harder, though.