For what it's worth the guy in the URL below seems to think that you can get a lard which is more or less equivalent to leaf lard by simply rendering the pork fat yourself. Seems to make some sense to me. And I know that the TEXTURE of a pie crust can be dramatically affected by a change in the fat, like using Plugra (also mentioned in the URL) instead of regular butter. Lard and Plugra move the texture of pastry in the same direction. I don't think olive oil would even be in the same ballpark for something like pie crust, but of course it wasn't suggested for that.
One of my favorite cookbooks, the Elote Cafe Cookbook, also strongly suggests making your own lard at home -- if you are making Mexican food (I know I am off topic) you want to be able to make delicious tamales. Tamales contain a lot of lard and the home-made stuff beats the heck out of the store bought stuff, at least according to the cookbook.
Anyway. See what you think. For what it is worth I also have spent frustrating years looking for things like caul fat and leaf lard. I even printed out the terms in Chinese to ask the butchers at the local Chinese groceries. Nada. (PS Just checked and you can buy caul fat from Amazon.com!!

And leaf lard here:
https://www.prairiepridepork.com/)
http://www.culinate.com/columns/bacon/C ... 2C+part+II