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@yoav
Don't shorten the chain. It will just cause problems shifting to the larger sprockets. Chain keepers are not usually needed on road bikes, only on mountain bikes where the front mech doubles up as a chain keeper with all that jumping and bouncing around.
What you might have a problem with is chain line. Shifting to the largest sprocket when on the big chainring is not usually recommended but you might get away with it. You may get a better chain line by putting chainring on the inside of the spider or replacing the bb with a shorter one.
Try it and see.