I assume you are looking for review/approval after a Form has been filled and submitted by end user. For that, take a look at Form Centric OSGi workflow & Inbox UI at AEM 6.3 Forms Help | Manage Forms applications and tasks in AEM Inbox
Did you consider the option to transparently forward the AF specific render/submit request from AEM via reverse proxy right at Apache or other proxy layer. So application container ui might still be requesting form from the same url as rest of the stuff but reverse proxy would fetch that from AEM in...