The current list of cipher suites in VyOS is outdated and many suites, supported by strongSwan are not available via CLI. We should actualize it.
Lists of suites supported by strongSwan:
https://wiki.strongswan.org/projects/strongswan/wiki/IKEv1CipherSuites
https://wiki.strongswan.org/projects/strongswan/wiki/IKEv2CipherSuites