Hi jsadfio, thanks for reaching out, and apologize for any inconvenience. For now, SafePal doesn't support exporting Private Key via Extension wallet, we have feedback to our dev team to see if we can support it in the future. And you can export Private Key from SafePal App to solve this first.
As for the " -26: dust" problem, please try to enter a small amount to see if it works, if still need any further help feel free to contact us at https://www.safepal.com/sitemap