...end of story it's possible with one commandline to do the round trip , copy to another host , have that host install package, and have the host reboot (maybe not on first try ok ? :)
The comparison to script shipped with kernel (circa 2012):
1) gmil works or attempts to work across many releases
2) gmil works harder to make packaged installable result(s)
3) gmil has a smart way to build many kernels at once / at a keypress
4) the scripts/ _can do most of those steps but _don't combine them, leaving maybe allot to read and type. ...