The only way I can see here would be to run a full node, explicitly deactivate full-rbf (not to be confused with opt-in rbf!) and put your transaction in there. However, I'm not sure if that would be the ultimate solution. My doubt would be that the forwarded transaction could be overwritten by the local full-RBF setting of the node forwarded. You would have to clarify whether the setting of the initial node has priority, or whether the mempoolfullrbf=0 setting can be overwritten by subsequent nodes with mempoolfullrbf=1.