Can you not get the same keyboard and have one at work and in the office?
Mechanical Keyboards
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We don't leave things here, it's an open office and we sit on different desks every time. It would very likely be stolen :P
You have no space to store your stuff? Like lockers?
Nope
You mention a different backpack. If you haven't looked around for that, I'd make that a priority. To to an outdoors shop, get something proper.
I daily use a Deuter AC Lite 16. It has no special compartment for laptops, bit my 14 inch just fits in a tight elastic near the back. For a bigger laptop, I'd place a hoodie in the bottom.
It's a small hiking backpack, and it's curved back sits extremely well, I think. It's great for biking, too.
The one you sent seems a bit much for my use, but from what I see there are surely better backpacks out there than the one I use, it's worth it to make some research there. It probably makes more sense to go to physical stores and try them out with my laptop and keyboard so I see what they're really like.