those examples are almost exclusively found in accusative plus infinitive constructions. Dare can be used in this construction (albeit with a very different sense, "to challenge …
"Dare say" in the sense of "regard as probable" is used almost exclusively in the first-person present tense - so much so that Lexico defines it as a fixed phrase: I dare say …
"Dare I say" or "dare I ask" should both be understood by your readers. For this particular context, alternatives might be: "If it's no trouble, ..." "It would be helpful if ..." …
he dares speak, not the phrase "b" he dare to speak. Regarding the phrase "c", the dare has been used as a semi-modal verb. Modal verbs such as, can, could, will, would, may, might, …
I am wandering "How dare I" is usally said from native speakers. If so, is it polite? If someone is better than me, but I just wanted to let them know. How dare I suggest that~ If I …
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