The only way for a formerly-suspended grey market stock to resume being quoted via OTC Pink Link is to regain Rule 15c2-11 qualification which requires a FINRA-approved Form 211. If a company is fully-reporting and current with its SEC filings, qualification with Rule 15c2-11 will allow its stock to resume being quoted via OTCQB.
Rule 15c2-11 allows market makers to make a market in a stock and quote their own bid and ask prices. A company can't file a Form 211 with FINRA. A market maker must essentially sponsor a company by filing the form, which requires extensive financial and company information.