I am ok with Electron if it is needed for Matrix. Also, Telegram has a C++ desktop client. Also, I would not advise to add proprietary repositories as you gran

I am ok with Electron if it is needed for Matrix. Also, Telegram has a C++ desktop client. Also, I would not advise to add proprietary repositories as you grant them root access to your system which is against security practices such as the principle of minimum privileges and defence-in-depth.