Estlcam will do everything in the machining order you specify. By default, just clicking in the machining order box, it will increment by 10. Note that negative numbers are processed LAST, so you can set the outside perimeter to -10 to ensure that it gest done after everything else is.
If you leave anything un-numbered, Estlcam will choose what it thinks is the best time for it, which can result in unwanted tool changes, so if you want to specify the machining order, you can’t do it half way.
Mostly though, I’ve started separating the projects by tool, so I will make one .gcode file with only the V carve pieces, then change the tool, and run a new program with only the 1/8" pieces. In general, because the 1/8" bit is often also used to cut the project out, I run the V carve bit program first. I have had success with bit changes, when I assign the machining order to all of the tool paths, though.