Use R_getVar over findVar

[MichaelChirico]

Closes #6180, IINM.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.02%. Comparing base (4d30c7f) to head (73b84b1).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7575   +/-   ##
=======================================
  Coverage   99.02%   99.02%           
=======================================
  Files          87       87           
  Lines       16750    16750           
=======================================
  Hits        16587    16587           
  Misses        163      163           

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[ben-schwen]

TY!