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retrouser15You should subsitute ext4 for FAT32 in the first command then. Additionally run blkid /dev/sdb1 by itself to determine which field has the UUID and change the -f int he cut command to match.
It will then use onlyt he flash drive. Symlinks are treated as if they exist in the source when they do not. So your SD card will not be written to using this method as it will reirect to the flash drive.
As with any advice on commands given via the internet ensure you have backups and check man pages if unsure. Not responsible for data loss. I have not tested this but was discussing it with someone earlier in any case.