I would leave as is, its not every day you will get a M1907 with the distinct red stripe etc, ( regardless if it looks like its mismatched) which Vintage hunter points out, its what was used on any non standard calibre i.e not .303, that was issued to the Home Gaurd, would say the bolt missmatch may of happened long ago, what you have there is a good piece of history doing anything to this would be criminal.

What you need to think about is how many have had that stripe removed ?