Yes, that is a great idea! There’s already a version string in the u-boot image, it should be just added to the filename, then the “roc-rk3399-pc-spiflash” should be a redirect to a file with a version appended. Same for all other firmware images.
These files are produced via CI through our GitHub. You can monitor changes there and see if the update is relevant to you. Each board is broken down on a branch basis. We do big updates once every half year or so. GitHub - libre-computer-project/libretech-u-boot