Scar them with sandpaper, and give them a soak in peroxide for a couple hours before doing whatever else you have in mind. And keep them warm, I shoot for ~28C using a seedling mat controlled by thermostat. Lots of old seeds do fine if they have been stored cool and dry.
Re. your dilemma, I have not had a strawberry strain yet that I did not like, including Strawberry Nuggets which I had in my grow this winter. Variety in strawberry bud sounds fine to me. Since the seeds will likely vary in germination success, you may want to start with more than you have room for. Might be an opportunity to just clean up those old seeds and see who is still up for mischief. How much room do you have?