It'd be cool to put a simple NBD front end on it with an nbdkit plugin. That'd let you trivially turn the immutable objects into Linux devices or use them as backing for qemu virtual disks. (https://libguestfs.org/nbdkit-rust-plugin.3.html)

Check out ZeroFS (https://www.zerofs.net), which is using SlateDB (https://slatedb.io/)

ED: Now I catch your drift, it would indeed be cool. ZeroFS requires a commitment to the SlateDB LSM data format.