I updated the ZRAM Slackware documentation for Aarch64, but should still work for ARM32. Let me know if I made any mistakes. I've only tested it on the Pinebook Pro so far. Compiling the kernel over and over requires too many reads/writes. Which is why I use this kernel modules for swap, log files and temporary storage in memory.
SlackDoc - zram_slackware_arm_and_arm64
I still plan on expanding the article. Suggestions or contributions welcome.