Use vim or a GTK based editor such as gedit or mousepad
CTL-SHIFT-nnnn [then release CTL-SHIFT]
eg
CTL-SHIFT-00E9 should display é [ leading zeros can be omitted ]
CTL-SHIFT-20AC should display €
CTL-SHIFT-35CA should display 㗊
CTL-SHIFT-1D71C should display
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