somehow i got attention of the Community Idee "Developer Studio - __c suffix removal " and wrote a BMC Developer Studio Plugin.
Here it is....https://communities.bmc.com/docs/DOC-114083 (to install the plugin, put it in the Developers Studio "plugins" folder, ps: you need write permissions on the entire folder structure;-))
How does is work:
1) you must use BMC Developer Studio's "Best Practice Customization" mode
2) right click on a "Custom" or "Overlay" Form
3) select "Remove __c Suffix from Field Names..."
4) all fields with an __c suffix get stripped-down
This Plugin is developed with AR API 9.1 Build 001 and Oracle JRE 1.8.0_121 and should work if you use BMC Developer Studio > 9.1.0. There is no Support, put you could add a comment here ;-)