The SNP has suggested it could sign up to the Conservative Government's controversial 'English votes for English Laws' - if Holyrood's Presiding Officer is consulted.
Pete Wishart, the SNP MP, said the party was concerned that the Commons Speaker would decide when to bar Scottish MPs from votes.
Instead, he suggested, officials at Holyrood and the Welsh Assembly should be involved.
Opposition parties including the SNP have accused ministers of trying to create two tiers of politician MP.
A vote on the plans is due on July 15, and could produce a close result.
Labour, the Liberal Democrats, the DUP and the SNP are all currently expected to vote against the changes.
Under the plans Scottish, Welsh and Northern Irish MPs would be banned from voting on 'England-only' issues.
But Labour, Lib Dem and SNP MPs warn that many apparently 'English' issues have significant knock on effects north of the border, including on Holyrood's budget.
Mr Wishart said: "A way that we might, might get around this is if the speaker was also to consult with the Presiding Officer of the Scottish Parliament and the Welsh Assembly.
"Maybe, maybe we could be in a position where there could be a certification process that would command confidence from Scottish MPs.
"But at this stage the government have shown absolutely no interest in trying to pursue along that basis".
He added: "We are looking to help the government along this process.
"But what we cannot have is two classes of MP."
He also denounced the current plans as a "constitutional disgrace".
A source said that the idea of consulting Presiding Officers had not been discussed in government.
Former LibDem Scottish Secretary Alistair Carmichael accused the Government of "an outrage" by trying to push through such a major constitutional change with a 90-minute debate on changes to Commons procedures.
He has written to the Speaker seeking to set aside Commons business next Tuesday for a debate on the process.
Labour has accused the government of trying to artificially increase its Commons majority of just 12.
The plans could make it harder for a future Labour government to change schools and hospitals policy south of the border without backing from English MPs.
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