What I understand is those courses are a thing in the past. Unlike EMS, the National Center of Licensing and Examining board of nurses seen that they were piss poor and stopped them. Again, unlike EMS, if the institution has < 75% pass rate, they are placed on suspension and if they do not improve in one year NCLE will remove their eligilibility and abilty to have nursing programs. Even the accredited, famous New York Regents (Excelsior) program have been under recent attack, due to not enough clinical time and studies. Many find out that they may be able to pass the RN boards, however; may not be able to get a license in many states (which makes it useless). Each state can decide, if they will allow you to obtain a license, dependent upon where you attended. Just because you passed the RN boards does not guarantee one to a license. When one applies for a license, one has to enter the college name and assigned number. The State Board decides, if they feel the program meets their standards and it is up to them, if they want to issue a license or not, again; it is not automatically given because you passed the RN boards.
I went through a bridge program (ADN) many years ago. Since then, returned and finished my BSN and completing my MSN as a Nurse Practitioner and Nurse Educator. My advice is to go through the whole program, unless you have several years experience in the hospital setting. In reality the most one will save in bridge courses is a semester, at the most. As well, EMS should never be considered a "hobby", we have enough of those type already. (the reason we get paid poorly)
I see very few remain in the field afterwards. Majority are tired after their shifts and like everyone else, soon have no time for another "job". Especially one ata a part time rate, pays about a 1/4 of what you can make as a part time RN.