Pronouncing rr as [χ]
I read that this is done in Puerto Rico. I was wondering if it’s easy to understand for other Spanish natives.
Yes, it is easy, but Puerto Rican variety is not well known. Other speakers know about l ("Puelto Rico") but not about X ("Puelto Xico"). It is interesting that the same process is happening in Portuguese (cachorro sounds "kashoXo").
Yep. Someone could ask "Are you French?" I've read that this consonant is used in one region of the island. Do you know Residente? he uses it sometimes, but not his brother and sister. It is interesting that there are minimal pairs with [h] (Puerto Rican pronunciation for /x/), like "cojo" (koho) and "corro" (koxo/koχo) or "jamón" and "Ramón".