Graduate School of Informatics, Kyoto University This document defines an initial experimental post-quantum signature profile and migration design for the Resource Public Key Infrastructure (RPKI). The profile uses Composite ML-DSA-65 with ECDSA P-256 for RPKI certificates, CRLs, certification requests, and CMS signed objects. The migration design introduces the composite suite at CA boundaries through Mixed Certification Chains. It preserves the existing RPKI object formats, repository system, validation procedure, and router-facing VRP/RTR model. This revision is intended for SIDROPS evaluation and does not update RFC 7935.