You can get away with that but for pure peace of mind I prefer all chain. Your 8 plait rode will chafe and if it rubs on rocks or anything sharp sticking out of the mud it will break - and without any warning.
You also run the risk of another boat
"driving" over your rode and cutting it with their prop. This is especially true it there is wind
in the anchorage and your line is taught and near the surface.
My first boat
was a Cape Dory
33 and I had 300' all chain rode (I forget the size) with NO windlass. Hauling up the 45 pound CQR
hand over hand every morning kept me in great shape.
And I never slept so well.