Is it acceptable to split one wide wire into two narrower wires in PCB layout?
This has no effect on signal integrity. However, it will have an effect when soldering the chip.

You have to make sure there is no copper between the pads, as this will bridge when soldering. This will look like a short for anyone optically checking the board.
You can usually do this with copper planes, or with traces. See what works.

Try at least to get this: