Python3-lark-parser not available on Ubuntu 16.04 (32-bit)

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I know foxy isn't officially supported on Ubuntu 16.04; it's the last distro that supports 32-bit and I'm trying to do ROS2 development.

Following the tutorial on building from source, it fails after

sudo rosdep init
rosdep update
rosdep install --from-paths src --ignore-src --rosdistro foxy -y --skip-keys "console_bridge fastcdr fastrtps rti-connext-dds-5.3.1 urdfdom_headers"

It fails at installing python3-lark-parser.

sudo apt update 
sudo apt install python3-lark-parser
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package python3-lark-parser

Cool. I'll install via pip. Installed pip, then uneventfully installed pip install:

$ pip install lark-parser --upgrade

Reattempted following the ros2 install from source tutorial, continues to fail when rosdep install reaches python3-lark-parser

Any ideas? Looks like this has been a problem, historically: https://github.com/ros2/ros2/issues/725 (this one is for debian, there's another post that's applicable to Raspbian Buster)