according to the resouces I'm using, you can use any part of speech with any of these (athough the example sentences listed are both with verbs - これは忘れようとしたところで忘れられない出来事だ。 and 今から急いだとしたって間に合わないだろう。)
Do you think that's referring to the same meaning - I could see the sentences you gave as fitting into the meaning on this page, but it feels like a bit of a stretch.