custom urls for sites/portals

sites have urls like this one:
https://<subdomain>.<domain>/suite/sites/<SiteName>

subdomains:
https://<subdomain>.<domain>/<PortalName>

We want them to be resolve them with the SiteName as the subdomain
https://<SiteporPortalName>.<domain>

Is it possible somehow to create a redirect url on your side (appian cloud) so that specific sites/portal can be resolved with unique urls. I am aware that we would have to create a dns delegation for that but the problem is that we cannot create delegations with url paths (i.e. /suite/sites/<SiteName>) and we do not seem to have a make that redirection.