FYI, I believe that the ttk.OptionMenu is essentially the same as the DynOptionMenu. ttk.OptionMenu added a `set_menu` which is the same code as DynOptionMenu.SetMenu, except the options are radiobuttons (which marks the current item.)
The only difference is that DynOptionMenu has a highlightthickness, but this isn't directly available on any widgets in ttk.
One other thing to consider is a Spinbox for the fontsize and maybe for the indentsize. There is a ttk Spinbox in the ttk documentation, but it doesn't appear to be implemented in Python.
https://www.tcl.tk/man/tcl/TkCmd/ttk_spinbox.htm
Maybe that should be added to ttk? Or maybe it didn't change from tkinter so that's why it wasn't added?