After Effects has the built-in feature to convert text layers into masks, and shape layers. Currently, the conversion always takes place on a left to right basis. However now that After Effects supports right to left text, and paragraphs can be created with R-T-L text, the conversion process should honour this setting and create the masks in reverse order. (NOTE that this is not as simple as reversing the mask order, as a single character may be comprised of several masks with various mask modes. The characters need to be created in right-to-left order.)