I do not know about your life's circumstances in the C.R. as to the relative safety of your town/city/village and the areas you usually frequent. As a result, it is difficult to relate directly to your question.
I have lived in the east and west of the US in small towns and dangerous cities. I only wear a back-up handgun when I am going to go into areas that are completely unknown to me, or involve long trips, or areas suspected to be dangerous. For example, a relative lives nearly 700 miles away and we visit her as often as we can. On those trips, I usually have two handguns on me. Of course, it involves only crossing Free State lines and not national borders.
My BUGs have been semiautos in .32acp, .380, and 9x19. My revolver BUG is in .38spl. It is this little Smith & Wesson revolver that I use as my BUG of choice most of the time.
Since you are using a 9x19 caliber handgun as your primary, you might consider a smalle and lighter pistol in the same caliber.