Can I use the helm chart transformations to completely remove a resource?

Yes, I do that to remove the Grafana tests from the Prometheus Operator chart:

function removeGrafanaTest(obj: any) {
    if (obj.metadata.name === "po-grafana-test") {
        obj.apiVersion = "v1";
        obj.kind = "List";
        obj.items = [];
    }
}

Ah there we go thanks. I figured there was a hack like this but couldn’t figure it out

Right, use a name that matches with your release name. (I use "po" since the names get really long already.)