I found a very simple way to achieve this which applies to probably any ARM64 linux kernels.
I posted it here because it's where I tested it:
forum.xda-developers.com
Without any additional module I just thought of patching the kernel so it does not decrement ttl of forwarded packets.
I posted it here because it's where I tested it:

The Definitive TTL patch
After trying nfqttl and failing, I decided to go on my way and, in the process, I found the definitive solution. Steps: 1) unpack boot.img 2) patch kernel image 3) repack boot.img Flash :D the patch is simple: In the linux kernet in...

Without any additional module I just thought of patching the kernel so it does not decrement ttl of forwarded packets.