Is it possible to fuse the DNA of two genetically different sperms into one singular sperm? In theory, half of the number of chromosomes in a normal sperm would come from one sperm and the other half could come from a separate sperm. In return, the fused sperm could fuse with a healthy egg cell for fertilization.
It would be theoretically possible to engineer such a cell, but something very similar can occur in nature, two sperm cells can fertilise a single egg cell, resulting in a fetus with DNA from both. See here