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If the concern is R value in the bedroom, then I would install rigid foam between rafters throughout attic where it is accessible. It WILL make a difference throughout the house. 2-3" should be enough. Not cheap but it does work very well. Not sure what part of the country you are located, by addition insulation in the wall where the doors goes is similar to having a Cool Collar on an air cool car. Sure it works on paper but in reality? Out here, 20 min fire rated is code. Door sweep and jamb weather stripping should be installed not for R value but to keep dust out of the bedroom which is more important IMO. Good luck
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