Schlage door knob

I have door handles in my house, but I wanted to temporary convert some of them to door knobs so that I can put on a child safety locks like this one.
https://www.amazon.com/gp/product/B01K3SOW98/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1

After a few years, the original handles can go back on.

Print the bottom 10 mm to test fit the knob.

No need for supports, but a brim is recommended.