Tweak parse_extra_args logic to not require argparser

[timkpaine]

No description provided.

[github-actions]

Test Results

8 tests  +1   8 ✅ +1   0s ⏱️ ±0s
1 suites ±0   0 💤 ±0 
1 files   ±0   0 ❌ ±0 

Results for commit 4e6cf69. ± Comparison against base commit 34beaea.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.69%. Comparing base (34beaea) to head (4e6cf69).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #6      +/-   ##
==========================================
+ Coverage   97.52%   97.69%   +0.17%     
==========================================
  Files           4        4              
  Lines         121      130       +9     
  Branches        2        3       +1     
==========================================
+ Hits          118      127       +9     
  Misses          3        3              

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