(1)
Yes, the first is adversative passive.
I can see why this usage can be confusing to learners, as you might expect it to be -たら instead of -ても, but it's still a conditional implying that being subjected to the action in question (十香 showing excess interest in the radio) would be a problem for the speaker.
You'll see it often in phrases like そんなこと急に言われても困る:
「急に言われても」は英語でどう表現する?【対訳】on such short notice... - 1000万語以上収録!英訳・英文・英単語の使い分けならWeblio英和・和英辞書
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The nuance could be "even if that happens (in addition to other things that might happen)", where as in some cases (like the 急に言われても example) it can have a nuance of "Well,
even if you tell me [lit. I'm told] that, what do you expect me to do?"
(2)
I'm having a hard time finding an online reference for this at the moment (I have some grammar references that explain this, but not on hand at the moment) but plain form verb + も is a valid grammatical expression, e.g. 決勝まで進む
も大敗した。
The nuance is basically the same as 決勝まで
進んでも or 決勝まで
進みましたが, though it's something you're more likely to encounter in written works or literature.
If I can find a specific online grammar reference about this, I'll follow up and post it after.