I would be willing to help update to 1.19 but will need some direction of how to do this.

I'm planning to do the updates (of all my mods, not just ClickThrough) this weekend.

In the meantime, you could try if the 1.19-pre2 version at https://modrinth.com/mod/clickthrough/version/1.19-pre2-fabric0.53.3-0.4 works for you, as there have been very little changes between pre2 and the final 1.19.

Thanks!