You can also use Autohotkey. It allows you to write your own macros & actually you can even go as far as writing complete applications, with self-contained .exe for other people to use. For example you could write a script that would automatically convert 'cx' to 'ĉ', 'Cx' to 'Ĉ', etc;. Just run the script (it runs in the background) & type 'cx'. You can even create an option in the systray icon to toggle the script. I thought I had the script somewhere but I can't find. It's super easy to learn though if you read the documentation.

I would highly recommend Autohotkey. I don't know if it works with Windows 10, since I only use a chromebook now, but when I did have a laptop (vista), it was one of my most used apps. It's actually the only thing I miss about Windows. It allows you to write your own macros & you can even go as far as writing complete applications, with a self-contained .exe for other people to use. For example you could write a script that would automatically convert 'cx' to 'ĉ', 'Cx' to 'Ĉ', etc;. Just write the script & run it (it runs in the background) & type 'cx' & it will change automatically. You can even create an option in the systray icon to toggle the script on/off with a right-click. I thought I had the script I wrote somewhere but I can't find it. It's super easy to learn though if you read the documentation.