I found an interesting chip in the Texas search engine, the LM25085. The difference is that this needs an external MOSFET, I will see what prices the Chinese offer me to see if the replacement is comparable in price.
I have the inductor located in one of my Chinese suppliers, at 0.29 USD, something cheaper than I use for the XL4016, and it is also smaller because it is of a lower value. I might finally be interested in using the same circuit to replace XL4015 and XL4016, if I get a good price for the LM25085MY/NOPB and the Si7149DP MOSFET.
I was surprised by the low values of the input and output capacitors that the LM25085 needs, only 22 and 47uF, while with the XL4016 it needs 470uF and 220uF, and the XL4015 needs 220uF and 330uF.
In the application diagram of the LM25085, it states that the input capacitor of 22uF is ceramic size 1206, and the output capacitor of SMT tantalum. Interesting that they are not electrolytic, so I can mount them more easily in my pick and place machine, because of the small size.