my quickshot on this was to get the ip myself and write it to the conf file like this:
myipstr=$(getent hosts my.dynip.com | grep -o '^[^\.]*.[^\.]*.[^\.]*.[^\ ]*')
#hosts is here my local hosts file, you might have to change that to your needs
# replace line 4 in wireguard.config with actual ip
sed -i '4s/.*/Host = '$myipstr'/' /storage/.config/wireguard/wireguard.config
# make servicename by replacing . with _ assuming your domainname in wireguard.conf is kodi.tv
servicename=$(echo "vpn_${myipstr}_kodi_tv" | tr . _)
# put connman commandos into two little switches
echo connmanctl connect $servicename > wgon
echo connmanctl disconnect $servicename > wgoff
now you can use those switches to start and stop wireguard.
If you cron schedule above script you are always equipped with your current ip.
