Hi,
Usually I do this way: dump dconf configurations that I want to export, eg:
dconf dump /org/ubuntubudgie/plugins/budgie-showtime/ > showTime.dconf
and load it by the means of a script like
dconf load /org/ubuntubudgie/plugins/budgie-showtime/ < showTime.dconf
Otherwise is possible to save and replace .config/dconf/user from one user to another but doing that in chroot when building my customized iso not always works (and don’t ask me why 
)
Sil