Your rpblem seems to be probably a 2nd degree block, and your first cardiologist doesn't seem all that keen to pop a pacemaker in.
I'd definitely recommend a second opinion. Go to any well known name brand teaching hospita, many have been named above and there are many more.
In my experience in medicine for well over 40 years I've found that the good ones all pretyy well do things about the same way, and I sure disagree with this silly ranking thing they have. (Even though I was on the list one year - still a silly system and should be tossed out or put on the shuttle and put into orbit!)
Anyway, it is possible that you might get the same "we can try it and see what happens" suggestion from a second or third opinion. Sometimes there is no clear cut RIGHT or WRONG way to do things.
By the way many pacemakers also contain circuitry for a defibillater as well. Also, atrial fibrillation and ablation is treted very differently from heart block problems. The only common denominator is that they are both electrical problems with the heart, but otherwise are completely different.