below the answer to your questions based on MS docs .
1. Can the trial site itself be extended separately from the environment?
No. If your trial site is created in a trial environment, it expires after 30 days or when your trial environment expires, whichever is earlier. The site trial and environment trial are linked.
2. Can you keep the site in a developer environment?
No. You can't convert a trial website to production in a trial or developer Power Platform environment. Conversion requires a sandbox or production environment.
3. Will purchasing a Power Pages license keep the site alive?
Purchasing a license alone doesn't prevent expiration. You need to actively convert the site from trial to production using the Power Pages admin center AND the environment must be sandbox or production.
Recommended path for your situation: before the trial expires, either convert the environment to sandbox/production first, then convert the site, OR migrate the site to an existing sandbox environment. As you work on projects and need to establish permanent sites that don't expire, you can apply Power Pages subscriptions and convert websites from trial to production.
Best regards,
Valantis
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