Tang asked for this a while ago so the entire world gets to have it.
If you wanna compile it and play around, turn on all three visgroups. But if you just wanna copy and paste it into a map of your own, leave them all off.

There's a known issue where it will sometimes fail to push you forward if lava_launchpoint gets deleted before it can push you, because someone else finished their jump somewhere.
This would be easily fixable if point_push had any output related to pushing people (which could then target !self with a Kill input, just like the trigger_catapult), but it doesn't.

I think it's technically possible to make this lighter on edicts by making it so the trigger_ignite is instead a trigger_catapult, but I swear I remember trying that and finding out that OnStartTouch doesn't work on trigger_catapult.
It would still be possible to make it lighter on edicts simply by putting a trigger_catapult under the trigger_ignite (which would probably also prevent fall damage on the lava), but I never cared enough to test that.