palm swells can be added, so I am sure you can mod a stock to help,m if you have the skills
but if it was me I would just talk to a sock builder and see what they can do , many will work with you and they have the means to make it right and look well and last long
think about it this way, MOST folks own a rifle a LONG time, so, its money well spent call it an investment, make shooting more enjoyable and hunting too
its why a well fitting shotgun makes you a better shooter
same with any gun,
one that fits you better you will shoot it better, working together over fighting things
and again there are YOUTH like rifles with these mods already in place