Note that you can now use TF providers "on the fly" from Pulumi: https://www.pulumi.com/blog/any-terraform-provider. No provider bridging/conversion necessary.
I just tried and it seems to have worked (though I haven't tested any specific resources yet):
$ pulumi package add terraform-provider lxc/incus
I'm a Pulumi user myself, and I haven't seen a Pulumi provider for Incus yet. Once I get further into my Incus experiments, if someone hasn't made an Incus provider yet, I'll probably go through the TF provider conversion process.