1.) here for the Bookworm OS. Bookworm 6.6.y for the uConsole and DevTerm
2.) I personally havent tried a high capacity sd card but you can go with this one (referred by Rex) Amazon.com: TEAMGROUP A2 Pro Plus Card 128GB Micro SDXC UHS-I U3 A2 V30, Read/Write up to 160/110 MB/s for Nintendo-Switch, Gaming Devices, Tablets, Smartphones, 4K Shooting, with Adapter TPPMSDX128GIA2V3003 : Electronics on the other hand, you can buy an NVME adapter from hacker gadgets for a better performance.
3.) no idea on this one, sorry.