nowadays there no need plaster ceiling anymore since its reduce height, unless your ori ceiling are high and you'd thick pocket

you google "plaster ceiling light" as below, can find some faux plaster ceiling light actually profile channel that shape to fit led light giving plaster ceiling looks.....

from google shope links:
https://shopee.com.my/product/1166274442/28...BCABEgLnGfD_BwE

https://shopee.com.my/product/1166274442/28...ASABEgKSlPD_BwE

https://shopee.com.my/product/493312502/298...ByABEgIPV_D_BwE

happy shopping