Remap key to two modifers or use meta shortcuts in terminal (terminator)

Question

Background: Running Arch Linux on KDE. KDE shortcuts have a problem with being saved past reboot so i'm using xmodmap and xbindkeys.

So I am using xmodmap. Right now caps lock is mapped to meta (hyper_L) which is assigned to Mod4 (along with Super). I am trying to use the meta shortcut (meta+c) that I've assigned to open chromium. While it works while I'm focused on some applications (like settings), in terminal it simply types c. When i changed the shortcut to ctl+9, it worked.

So:

How do I use meta shortcuts in terminal (terminator)?

or

How can I map caps lock to two modifiers (either ctl+shift, ctl+super, or ctl+alt) as opposed to just being mapped to one modifier? And do you have a recommendation on what combo would be best for custom shortcuts as not to interfere with most other shortcuts?

My .xmodmap looks like this:

clear Lock
clear Mod4
add Mod4    = Super_L Super_R Hyper_L
keycode 66 = Hyper_L

and xmodmap yields:

shift       Shift_L (0x32),  Shift_R (0x3e)
lock      
control     Control_L (0x25),  Control_R (0x69)
mod1        Alt_L (0x40),  Alt_R (0x6c),  Meta_L (0xcd)
mod2        Num_Lock (0x4d)
mod3      
mod4        Super_L (0x85),  Super_R (0x86),  Super_L (0xce),  Hyper_L (0xcf)
mod5        ISO_Level3_Shift (0x5c),  Mode_switch (0xcb)