Remap capslock and enter to control modifier

I want to remap two keys, not just one. Specifically, I want to: 1. Remap capslock to control and escape, and 2. Remap return/enter to control when it is pressed with another key. Based on the two links above, I managed to remap each key separately using xkb and xcape , but I couldn't figure out how to remap both keys, capslock and enter by merging the two solutions given above. I strictly do not want to use xmodmap as it will loose effect after I reboot my Ubuntu 16.04. Specific code script that accomplishes both tasks 1 and 2 will be appreciated. Those who use vim or emacs's evil-mode appreciate the significance and convenience of having control key at your home row by hitting capslock and enter!