Peterhead a possible.
Sunny Govan a definite NO as the self preservation have already said there is no road to SFL for the Gers.
What they said is, they have no power to impose relegation. The SPL will need to consider admitting a newly formed club in. (If it comes to that) If the decide not to, the new club will need to apply to another organisation to play in. In this case The SFL.
If they do go belly up, I think The SPL will let them back in anyway. Doncaster has said as much already. They might dress it up and impose some sanctions, but they'll let them back.