Hi f757lkk. Welcome to the Zone!
MOST, who install DROs do so enroute to CNC. DRO is not needed for CNC, so DRO money spent is often virtually wasted.
Everybody wants to maintain manual control at first. SOME actuallly DO it. Almost everyone quickly stops using manual control. Manual control is at least POSSIBLE if you use the stock lead screws.
If you install Ball Screws though, Manual control is not feasible because there is no friction to hold the table still against cutting force.
MY philosophy is to FIRST do simple CNC with stock lead screws THEN use the new CNC capability to manufacture more capable mounts. A good lathe is necessary to machine ball screws. Sans lathe, there are factory machining options and enterprising forum members who do this for low cost.
There are many kits available for less than Syil price.