I see 180mm solid axles available, wonder if they would make you a longer. https://wheelsmfg.com/products/hub-parts/all-axles.html?axle_type=6863 I've bought before from them.
EugeneNine
They are not intended to be a finished product, you are supposed to add your own display and keyboard. If you want really portable start with the Pi zero which doesn't have the big ports, then slap on a small display and keyboard of your choice. There are small kits like these https://ameridroid.com/collections/all-products/products/odroid-go-advance for example. There are also a few different ones with blackberry keyboards https://liliputing.com/beepberry-is-a-79-hackable-pocket-computer-kit-with-a-blackberry-keyboard/ https://arstechnica.com/gadgets/2023/05/its-a-raspberry-pi-a-blackberry-keyboard-and-a-battery-its-the-beepberry/ (when blackberry quit making hardware they surplussed a bunch of keyboards)
WD-40 is not just better as a cleaner than a lubricant, it actually is a cleaner and is not a lubricant. It just happens to be oil based so it get used as a lubricant often. Dishwasher shouldn't hurt for just one cleaning, but not really necessary. A degreaser like simple green and an old toothbrush for stubborn grease/dirt works well. (keep your old toothbrushes for cleaning)
I scanned all my college notebooks many years ago. Have this little handheld scanner called an CapShare by HP and on a rainy day one weekend scanned them all in. Only takes up ~250MB