Were it me I would shoot it for a bit to ensure it fits by shooting well with it.
Once fit is confirmed then consider one of three courses.
1. Leave it alone as is and have the inset and extension recoloured by someone like Mark Larson to blend it seamlessly. (Mark Larson blended an extension for me on a gun which looked great and has held up for three seasons of regular field use.
2. Change out extension and pad for longer extension and thinner solid pad or or butt plate. Have the inset and extension recoloured by someone like Mark Larson to blend it seamlessly.
3. Send it to someone like Kody Kearcher and have a butt transplant which cuts the stock off at the pistol grip. Kody did one for me on a Prince of Wales grip which came out great. I know some on this board have had issue with Kody, though he was not fast my experiences on quality of work have been good,
