It would not be possible to convert these to the 175° swing. Assuming these are non-fire rated openings it would be possible to install a pivot conversion such as the items as seen here:
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allowing you to bypass the bottom spindle in terms of the floor closer acting as a closer. You could done consider installing parallel are mounted door closer such as the LCN 4040XP as seen here:
which you can template to 180° swing.