I wonder if it would be possible to use the script from 
sys-apps/getent(included below)
to impl. getent in user.eclass instead of using glibc's getent? I cannot see 
any downside, is there one?

This would help a lot(just seed your groups/users is in ROOT/etc/{passwd,group 
...} first)
when cross building or ROOT != / as it would be trivial for the script to 
respect ROOT/EPREFIX 

sys-apps/getent:
#!/bin/sh
#
# Closely (not perfectly) emulate the behavior of glibc's getent utility
#
#passwd|shadow|group|aliases|hosts|networks|ethers|netgroup|protocols|services|rpc
# only returns the first match (by design)
# dns based search is not supported (hosts,networks)
# case-insensitive matches not supported (ethers; others?)
# may return false-positives (hosts,protocols,rpc,services,ethers)

[ -z "$PATH" ] && PATH="/bin:/usr/bin" || PATH="${PATH}:/bin:/usr/bin" export 
PATH

file="/etc/$1"
case $1 in
        passwd|group)
                match="^$2:\|^[^:]*:[^:]*:$2:" ;;
        shadow)
                match="^$2:" ;;
        networks|netgroup)
                match="^[[:space:]]*$2\>" ;;
        hosts|protocols|rpc|services|ethers)
                match="\<$2\>" ;;
        aliases)
                match="^[[:space:]]*$2[[:space:]]*:" ;;
        ""|-h|--help)
                echo "USAGE: $0 database [key]"
                exit 0 ;;
        *)
                echo "$0: Unknown database: $1" 1>&2
                exit 1 ;;
esac

if [ ! -f "$file" ] ; then
        echo "$0: Could not find database file for $1" 1>&2
        exit 1
fi

if [ $# -eq 1 ] ; then
        exec cat "$file"
else
        sed "s/#.*//; /$match/q; d" "$file" | grep . || exit 2
fi

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