I have found a way to access the series record menu since my last post.
It turns out to be a right click menu item.
When you are in the epg guide, right click on the program you're interested in to get the new menu.
In the right click menu, select "add timer".
For those of us using our TV remote control (CEC or IR), there is an additional problem we must overcome - there is no right click mechanism on the remote. However, I have found a workaround for that problem.
If you have not done so already, download and install the "Keymap Editor" add-on which will allow you to assign kodi functions to keys on your remote. To resolve the issue, goto "Global->Navigation->Context Menu", click select and then click the key you want to assign to "Context Menu". With this done, you can now click your "magic context menu button" to bring up the right click menu so that you can access the add timer menu item.
I still believe having "add timer" in the record menu like it was in Isengard was a better way to setup a series recording. However, this workaround will get the job done although it's not as convenient.