So something is wrong with grig when it controls IC-7410. I might trace the source code of either grig or Hamlib, but another possibility is to write your own control program for the rig you have. It does not have to be generic, so the program and its user interface can be simple and can fit your own needs. For example, I do not need any functionality not relating to CW, such as VOX gain and COMP, etc.
I can use a charater based user design like I did in my previous article CW Keybord, but I think this time I will use some GUI.
I have played with OpenGL, GLUT, WebGL, etc., but is it my first time to use GTK+?