Chebucto Regional Softball Club

It’s technically still invisible. But as there is not clear rule for that I'd say it’s up to interpretation.

No. If we assume that you have to target the wall it would at the very least stop after destroying the wall. But by RAW, you can’t even cast it on something behind the wall, because you cannot target something (or someone) with a spell if they are behind total cover. Total cover is created by being behind completely behind an obstacle (like a wall). This counts even if the obstacle is invisible. Furthermore, because if you chose an invalid target for a spell, you'd still expend the spellslot but there would be no effect. So you actually spend a sixth level spell a lot to achieve nothing. I would not recommend doing it this way, but that’s what the rules say.

Oh definetly. I assume that RAI this is the intention.

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The the theoretical problem just solved itself. Neat. Thanks.

I know that it would be out of character, but now I'm trying to make up a plan how this might work. If Mystery can counterspell, then if you send him along while disguised as someone else, it might be possible. However, as you've said, it would not really accomplish much anyway and Konsi would never do it.