By doing this you are possibly relocating the handle further out which in turn will load up the spring, which is not a good idea as will lead to premature failure, You still need to keep the starter under same spring tension but move handle up for easy reach, i understand exactly what you are trying to achieve but IMO you will need to buy a longer pull cord, also buy and fix a pulley wheel to your frame as pictured above, its easy to do you just need to work out total lengths required and buy necessary materials.
Hopefully this helps and you understand what i'm saying