Here's a hack to get what you want and keep it simple:
Create two shared calendars (or not shared if you aren't sharing this "Reminder" list) in Calendar. This eliminates the need for having two apps as it's all done in Calendar.
I suggest calling one of the new Calendars "Not Calendared" (I know "Calendared" isn't a word, too bad, it fits here and I'm using it👿) and the other "Completed" (or use whatever two names you please).
Create "Reminders" in the "Not Calendared" Calendar. Check and uncheck (in the calendar list) to view, and then hide the "Reminders" to keep them from cluttering the regular calendar view. You can see them at any time as they won't be viewed most of the time and can even easily move them to a regular calendar as a calendared event if you want to see them "ongoingly" (see Calendared👿). Once a "Reminder" is moved to a regular calendar is not longer a "Reminder" but then becomes a Calendar event. It really is just a matter of what you want to see in your "Calendar" display vs your "Reminder" display. It just words and conventions and you are free to make up words and conventions however you choose. Ah, the power and ease of freedom!
Yes you lose the geofencing of the Reminder App and if that is really useful then for now bite the bullet and put geofenced items in the Reminder App and have TWO places to keep track of stuff.😠 Hopefully Yosmite Sam will come to the rescue in a few months and restore some Apple elegance to this situation.😎
When you complete a "Reminder" move it from the "Not Calendared" Calendar to the "Completed" Calendar and leave the "Completed" unchecked unless you want to view your completed items which are always available in the "Competed" calendar as it is currently in the Completed section of the Reminder app.
Enjoy!