If OBS is going to be removed, i’ve talked with basil from openrepos and he will accept use of openrepos for OTA packages!
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You can create a single application (one per release or device) and upload all packages to it.
Make sure to have the main package(meta package or whatever you have as a base installation package) as a #1 in list of uploaded apps (version settings as well some other info will be pulled from it).Check this application as an example: Developer Mode | OpenRepos.net — Community Repository System (note lots of apps)
or this one: libchewing | OpenRepos.net — Community Repository System (note main and devel package).You may select the “Libraries” category for them. Such applications are not displayed on main pages or within the storeman app when updated.