After reviewing the bug, engineering has declined this request due to it being a very narrow use case.  

It seems that our backline team found a workaround for the post section of kickstart and was documented in the customer support case:

%post --nochroot

# Current order is: RHEL,<rest>
ORDER=($(efibootmgr | awk -F ':' '$1 == "BootOrder" { print $2 }' | tr ',' ' '))

# New order will be: <rest>,RHEL
NEWORDER=(${ORDER[@]:1} ${ORDER[0]})

efibootmgr -o $(echo ${NEWORDER[@]} | tr ' ' ',')
%end


I am going to mark this CLOSED/WONTFIX. Please contact me directly if there is further interest in this issue.