So you type in vi and copy the processed results to the input blank? Or do you have further automation to handle that for you?

Many installed fonts have character U+2010:

Adobe Caslon Pro
Adobe Caslon Pro Bold
Adobe Fangsong Std R
Adobe Garamond Pro
Adobe Garamond Pro Bold
Adobe Heiti Std R
Adobe Kaiti Std R
Adobe Myungjo Std M
Adobe Song Std L
Alba
Alba Matter
Alba Super
Arial Unicode MS
Baby Kruffy
Balloon
Bell Gothic Std Black
Bell Gothic Std Light
Berlin Sans FB
Berlin Sans FB Demi
Birch Std
Blackoak Std
Brush Script Std
Calibri
Californian FB
Cambria
Cambria Math
Candara
Chantilly
ChantillyLH
Chaparral Pro
Charlemagne Std
Chick
City
Code2000
CommercialScript
Consolas
Constantia
Cooper Std Black
Corbel
Croobie
DejaVu Sans
DejaVu Sans Condensed
DejaVu Sans Light
DejaVu Sans Mono
DejaVu Serif
DejaVu Serif Condensed
DFKai-SB
Eccentric Std
Estrangelo Edessa
FangSong
Fat
Freshbot
Frosty
Gabriola
Gautami
Giddyup Std
GlooGun
HandelGothic
High Tower Text
Hobo Std
hooge 05_53
hooge 05_54
hooge 05_55
Jenkins v2.0
Jokerman
Jokewood
KaiTi
Kozuka Gothic Pro B
Kozuka Gothic Pro EL
Kozuka Gothic Pro H
Kozuka Gothic Pro L
Kozuka Gothic Pro M
Kozuka Gothic Pro R
Kozuka Mincho Pro B
Kozuka Mincho Pro EL
Kozuka Mincho Pro H
Kozuka Mincho Pro L
Kozuka Mincho Pro M
Kozuka Mincho Pro R
Kristen ITC
Letter Gothic Std
Liberation Sans Narrow
Linux Biolinum G
Linux Libertine G
Lithos Pro Regular
Lucida Bright
Lucida Sans
Lucida Sans Typewriter
Lucida Sans Unicode
Magneto
Meiryo
Meiryo UI
Mesquite Std
Microsoft JhengHei
Microsoft PhagsPa
Microsoft YaHei
MicroSquare
MingLiU
MingLiU_HKSCS
MingLiU_HKSCS-ExtB
MingLiU-ExtB
Minion Pro
Minion Pro Cond
Minion Pro Med
Minion Pro SmBd
MS Gothic
MS Mincho
MS PGothic
MS PMincho
MS UI Gothic
MVGothicCond
MVGothicCondSC
MVGothicH
MVOldstyle
MVOldstyleSC
MVSans
Myriad Pro
Myriad Pro Cond
Myriad Pro Light
Niagara Engraved
Niagara Solid
NSimSun
Nueva Std Cond
OCR A Std
OcrA
OcrB
OnStage
OpenSymbol
Orator Std
Palatino Linotype
PMingLiU
PMingLiU-ExtB
Poornut
Poplar Std
Porky's
Prestige Elite Std
Pretoria
Pussycat
Ravie
Rosewood Std Regular
Segoe Condensed
Segoe UI
Segoe UI Symbol
Showcard Gothic
SimHei
SimSun
Stencil Std
Stop
Sylph
Symbola
Tekton Pro
Tekton Pro Cond
Tekton Pro Ext
TITUS Cyberbit Basic
Toxica
Trajan Pro
Trebuchet MS
Vani
Weltron Urban
Zephyr

It's seems that Gentium is simply not one of them. Neither is the copy of Georgia I have installed.

A few years ago I started writing a book on electromagnetism for kids and curious nontechnical folks. The early chapter on scientific notation and unit dimensions was driving me nuts, trying to type ×,∙,∕, and thin space all the time. So I got an "Xkeys stick" to put above the function key row. Nice hardware, but the software was utterly useless, and only let me set up macros for keys I could already type just fine! I tried hacking the data tables, and tried using it in plain USB Keyboard mode generating keys that are defined but not present like F20 (and letting a keyboard mapper program take it from there), but nothing worked. So I went to the driver level and made my own trivial program.

I have a hobby of fixing em-dashes on Wikipedia.