most of the videos people are using 1/4’’,1/8’’ collet i do hand routing useing 1/2’’ collet alot less vibration so you can use the same when cnc routing ?
Yes, it should be possible, but you’d need a mount which will accept a router which will take a 1/2" collet — the Makita tops out at 3/8"
The community has some notes about other router and spindle options at: https://wiki.shapeoko.com/index.php/Endmills
The two recommended spindles/routers that are available for the Shapeoko only can fit a 3/8 to 1/4" collet, so no 1/2 bits (cutters) can fit. A few owners have managed to make/buy brackets so that a larger router can attach to the Shapeoko, but it is not common.
I believe the weight of the larger routers are a concern (since the Z motor isn’t that strong and still only uses a 6mm belt)