I think the substitution below should not be in
ccmp as it interferes when a umatra is applied to a rakar form.
When the last two lines are left uncommented, I get the following for
Ka Halant Ra uMatra
Which is incorrect. When commented, I get the correct form:
The second glyph is the
ra_uMatra-deva whose substitution is also present in blws:
Am I missing something?