Encryption with random key

[Popyllol]

Hi ZFS-Guys,
is there a way to make a dataset with a random one time key? I know it sounds a little bit crazy but for swap volumes and some other purposes it makes sense.
At the moment I use something like this with systemctl:

[Unit]
Description=ZFS Random Cryptography Setup for %I
Documentation=man:zfs(8)
DefaultDependencies=no
Conflicts=umount.target
IgnoreOnIsolate=true
After=systemd-random-seed.service
BindsTo=dev-zvol-rpool-%i.device
Before=umount.target

[Service]
Type=oneshot
RemainAfterExit=yes
TimeoutSec=0
KeyringMode=shared
OOMScoreAdjust=500
UMask=0077
RuntimeDirectory=zfs-cryptswap.%i
RuntimeDirectoryMode=0700
ExecStartPre=-/sbin/swapoff '/dev/zvol/rpool/%i'
ExecStartPre=-/sbin/zfs destroy 'rpool/%i'
ExecStartPre=/bin/dd if=/dev/urandom of=/run/zfs-cryptswap.%i/%i.key bs=32 count=1
ExecStart=/sbin/zfs create -V 4G -b 4k -o compression=zle -o logbias=throughput -o sync=always -o primarycache=metadata -o secondarycache=none -o com.sun:auto-snapshot=false -o encryption=on -o keyformat=raw -o keylocation=file:///run/zfs-cryptswap.%i/%i.key rpool/%i
ExecStartPost=/sbin/mkswap '/dev/zvol/rpool/%i'
ExecStartPost=/sbin/swapon '/dev/zvol/rpool/%i'
ExecStop=/sbin/swapoff '/dev/zvol/rpool/%i'
ExecStop=/bin/sleep 2
ExecStopPost=/sbin/zfs destroy 'rpool/%i'

[Install]
WantedBy=swap.target

With an zfs encryption option like -o keylocation=random:/// or -o keylocation=random:///dev/urandom there would be no need for this workaround.
Any thoughts?
Greetings,
Lars