I had years of doing that. Sold 400 draft ewes at 3 crop their prime every year and lambed 500 shearlings and kept hundreds with no teeth. It can be done but there can be a few disasters along the way.
Cull ewe values and disposal charges have persuaded me to keep a relatively younger flock
Sometimes you have to do what you have to do though
I’m seriously considering the other end of the scale [emoji85] buying 300-400 draft ewes every year... lambing then... then kill the lambs and any ewes loosing teeth or condition ect and repeat probably carry 150 a year over from the batch and kill them in second year