I know this is kinda weird.  

I was playing around with the source code of syslinux.
Somehow I managed to compile the required binaries for tc-install on piCore aarch64.  

Then, after packing up the files and doing some tests.
I have successfully created a bootable USB with x86 core only. (install from net, frugal, core only)
There are other modes that I haven't tested yet. (cdrom, local tce, GUI ...etc)
Does anyone think it 
could be useful and 
should be submitted to the repo ?