I wouldn't worry too much about a clicky pickup to start with , it's quite a specific sound and bare in mind they didn't have them in the 50s 60s
changing a bass to a lefty is a big expensive job, taking the front off making a new bass bar etc. plus you couldn't play another bass if you had a gig with a house bass, I'd stand on the other side if you can
pickups are an absolute minefield , one pickup may sound great on one bass but not the next, my advice would be don't get too caught up in it to start with