@Zazie, I am inclined to agree with
@NotSoMini.
I find, that when trying to create complex recipes, it is best to do it in stages. It may seem to take a bit more time... but, unless you are extremely familiar with the concentrates you are using... it is likely going to save time in the long run. When combining several unfamiliar ingredients all at once, it is hard to know which ingredient is doing what (muting, dominating, pulling others off track, or just wrong for the effect you are seeking). You can spend a lot of time, trying to "fix" a problem that is nonexistent, while the real problem child remains unattended.
Instead, I find it more informative,
and productive... to do it incrementally.
First, figure out how the (desired) end result in "layered." What are the core components? What are accents? Do some accents take precedence over others? Think of dominant, vs. weak, flavors. Then, when you have that figured out, you can start developing the recipe the same way... one layer at a time, starting with the most dominant, and progressing one ingredient at a time. In this manner it is easy to tell when one ingredient is (or isn't) working in the recipe.
I am not personally familiar with Arroz con Leche. But, after doing a bit of googling and recipe reading, I might start with something along this line:
-- The rice pudding seems to be the center of this dessert. However, it (the real dessert) does not seem to depend on eggs for binding/setting up the custard-like milk base (instead, depending on the rice starch). Therefore, I would think twice about using either a heavy custard (normally "eggy"). Getting this rice foundation correct, seems (to me) to be imparative. Without this being right, nothing else is going to seem right either.
I have not tried any rice concentrates; so I am no real help. If I were in your shoes, I would start by dong SFTs of your three rice possibilities (if you haven't already). One, or the other, may work. Plus, you can experiment at the same time, by trying different combinations of them (if needed).
If that sounds like more work than you are willing to do; then, you might consider trying enyawreklaw's
YEO recipe on ATF. The description seems to be pretty solid for a rice &dairy foundation. And, it has received a lot (for ATF standards) favorable reviews. It is also quite simple (often the best kind).
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If this is not "thick" enough on its own; swapping out the TFA-Vanilla Swirl for a
light custard (like INW-Custard) might help tighten up the dairy note.
Once you have the rice pudding where you want it, then add the next most prominent note... maybe the raisins(?). Get that balanced the way you like, then add the next most prominent (cinnamon?). And, finally the orange (assuming that is the lightest note).
Lastly, once all the flavors are right and balanced, evaluate the whole for the possible need of added sweetener.
The benefit of working on one flavor note at a time, is that you will immediately know when an ingredient is trying to yank your recipe off course, and will be able to correct it.
This is by far, not the only way to flesh out a new concoction, but it works for me.
Just remember one of the DIY primary rules: "Don't add an ingredient unless it is actually contributing something." It is often easier to start with too few ingredients, and add to fill in the missing pieces; than it is to start with too many, and try to figure out what needs to go.
Didn't vape for at least 2 hours after that 
