Evergreen needles to help alkaline lawn

My dandelions really like my lawn. I like dandelions, but not this many. I know I have alkaline soil. My neighbors recently trimmed their over grown evergreen shrub (juniper or cypress of some sort judging by the needles.) I offered to dispose of the cuttings. My question is since I've shredded the trimmings, would it be wise to sprinkle the shredded needles and smaller branches around the lawn to help mitigate the alkalinity, and introduce organic matter into the silty clay. Should I wait a year for them to brown? Or should I add them to the compost pile? Or plant something that loves acid and mulch it with the trimmings?

Well, there are some downsides of the needles, but in your case, the up sides outweigh the downsides.    Go for it!