The short answer is no. A 403 that lands at the account or organisation level is a decision about the account, not about the payment. Changing who pays, or paying from another country, does not lift it — and a second payment can end up stranded behind exactly the same block.
One detail is worth noting: this was reported as a 403 on two different upstream model providers at once, after a payment from a China-based account. Two providers refusing together is hard to explain as a per-payment problem, which is another reason not to spend money testing payment methods against it.
What to ask for instead is a billing or compliance review of the account or organisation, and — if eligibility cannot be restored — an explicit answer about the balance. Before you ask about a refund, check how you paid: OpenRouter states that credits bought with a card can be refunded within 24 hours of the transaction, and that cryptocurrency purchases are never refundable. ROZO cannot change any of this, and this is not a case where paying through us helps. ROZO is independent and not affiliated with OpenRouter or Coinbase.