The beacon might work if you poke a hole in the obsidian sphear surrounding the base.
In rotunda^4 there are a ton of chiseled diamond blocks blending in with the decorations.
A portable drive is a good way to store loot. As are chches. Or strongboxes.
I thought the bedrock might have been wider than that, but hadn't pillared up to check. It works now, so I added a couple more on the other side for complete coverage for regen at least. I decided to go with a smarter starting hammer--iron for easy repair & max out the speed after silk touch (I had originally gone with cobalt & reinforced).