You can actually install Librespot for 64-bit, you can either compile it yourself (which is quite easy, I have done it myself) or use the package someone built.
You can find instructions to compile librespot as well as a prebuilt aarch64-RPM in this thread:
Instruction: Cargo install error: "This is the stub cargo. If you see this, scratchbox2 is not working" - #5 by Levone1
Pre-built RPM: Cargo install error: "This is the stub cargo. If you see this, scratchbox2 is not working" - #10 by Levone1
I have Hutspot and Librespot running on my Xperia 10 III and use it everyday on my 2-hour-travel to school, and it works (almost) flawless!