9:4a Otherwise, if any Macedonians come with me and find you unprepared,

Otherwise, if some Macedonians come with me and see that you (plur.) are not ready,
-or-
Some believers from Macedonia may come with me. If they see/discover that you have not prepared ⌊your gift⌋,
-or-
If some Macedonian believers come with me ⌊to you⌋, they might find that you have not prepared ⌊your gift⌋.

9:4b we—to say nothing of you—would be ashamed of having been so confident.

we (excl.) would be humiliated for being so confident—to say nothing of you.
-or-
we would be ashamed by our thinking with no doubts that you ⌊would do as you said you would⌋, but you would be ashamed even more.
-or-
If you are unprepared, that would shame us for being certain about you. It would shame you even more!

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