One very simple approach would be to simply upgrade your old app to have the new functionality of your suite app, and then rename and re-price the "old" app (which is now your suite) to reflect its new status (e.g., add the word "suite" onto the name). So far as Google Play is concerned, it will still be the same app, only "better." You will keep all the credibility gained from installs of the old app (by essentially upgrading the old app). Your old users will be happy because (as you've described it) they will have all of the old app's functionality, plus some additional functionality.
When I say "upgrade," that doesn't mean that you have to start with the old app's code base; you can just create an entirely new project and APK, so long as you use the same package name and upload it to the old app's location on the Google Play store, and so long as functionally it covers all of the bases expected by your existing user base.
Based on your description, I really can't see the down side of this. It may be that by conceiving of this feature superset as a new product rather than as an update you've created a problem that need not exist.