Hi Gyorgy 
Have reworked on the patch for the points you suggested and shared V2
openembedded-devel@lists.openembedded.org | [meta-oe][PATCH v2] image_types_sparse: switch ext* conversion to ext2simg_android
Have added the details you suggested in changelog 
Thanks for highlighting the redundant usage of redundant class-native"

Request to please have an look at version-2 and let me know if any suggestion 
Will start the android-tools discussion in parallel as suggested 

Thanks ,
Ashish