Further experimentation shows that this solution works:
$ cat /usr/share/X11/xorg.conf.d/20-trackpoint.conf
Section "InputClass"
Identifier "Trackpoint Wheel Emulation"
MatchProduct "TPPS/2 IBM TrackPoint|DualPoint Stick|Synaptics Inc.
Composite TouchPad / TrackPoint|ThinkPad USB Keyboard with TrackPoint|USB
Trackpoint pointing device|Composite TouchPad / TrackPoint"
MatchDevicePath "/dev/input/event*"
Option "EmulateWheel" "true"
Option "EmulateWheelButton" "2"
Option "Emulate3Buttons" "false"
Option "XAxisMapping" "6 7"
Option "YAxisMapping" "4 5"
EndSection
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TrackPoint wheel emulation lost on suspend/resume
https://bugs.launchpad.net/bugs/648135
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