I was thinking that I could just leave room for some of the holes while glueing the planks.
This is a useful technique when glueing up posts in this manner and is actually relatively common these days. You essentially leave a mortise instead of chiselling it out afterwards.
The second option seems to be the easiest since I would then only need to make ...
I've had good results using 3M Command Strips to attach wood to painted drywall.
The Command strips remove completely without damaging the wall.
Below is a rough drawing.
You would have to look at your application to determine the right size wood (2x4? 2x2?) how many Command Strips and if the should be attached the vertically or horizontally.
I don't ...
I thought I'd expand on my Comment as well as provide a direct solution to the your query, although I'm not certain it's the best way to go about this. But it is what you asked and that's what we're set up to provide Answers to, as much as possible.
I was wondering if there was a way to attach a block or something to the wall with no damage tape (like ...