I think most LSD is absorbed in the first minute when its in your mouth, through the mucous membrane and then straight to your veins (and then to the brain and so on). When something is swallowed, it is subjected to first-pass metabolism, the liver will have a go at it and maybe enzymes in the gastrointestinal tract too...
Im not sure how much it would affect the effects of LSD if it was swallowed and not absorbed through the mouth, maybe it would change effects or time of come up or something.
You could keep the multiple blotters in your mouth for some minutes, and if you dont like to swallow it, spit them out,since most should have been absorbed. If you're paranoid about losing any, spit it in a glass and put either a bit of ethanol or water and you can swallow that after if the trip isnt strong enough (gross I guess? But its your own spit...

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