[Sebos]

I don't even need to use a separate remote because of the perfect integration with my TV via HDMI CEC. As soon as I switch to N2 CoreElec I can use my remote to control everything. The only BIG thing I am missing is the long press for the menu on any item in Kodi. If I long press the OK button on my Sony Bravia remote it will just repeat the same action, not recognize the long press.

You can use the Keymap Editor in Kodi to fix this (that's what I did) : you can specify whatever button you want on your TV remote to act as the long press action.
Just chose a spare button which isn't already used in the Kodi interface.
My advice : plug in a mouse just in case, especially if you don't have another remote. If you mess up, you can end up with a broken interface (ie. not being able to go back in the menus).
It happened to me once, I had to reinstall Kodi