Need advice on installing a hangboard on a terrace beam without drilling

https://preview.redd.it/we10vkza4yee1.jpg?width=1280&format=pjpg&auto=webp&s=28af8238bb6b37388c43a079079b1ef82538c22f

Hi guys! I've been racking my brain trying to figure out how to install a hangboard in the apartment I rent, and this architectural beam on the terrace outside is the only viable spot I could come up with.

The beam is a fixed-ended type (connected to the wall on both sides), measures 21x21 cm, and is sturdy enough to hold my weight. I sometimes use it as-is instead of a hangboard, but the edges are a bit too sharp to be comfortable.

Do you know of any hangboards or other equipment that can be installed on a beam like this without drilling? Thanks in advance for any advice!