Your situation begs the question of why none of your employers for the several years you were doing client service and admin were willing to support your PY?

The costs and risks to advice firms of supporting a PY adviser are considerable. Most would be unwilling to support a PY who hasn't spent a couple of years working for them in junior roles. It's not so much about gaining generalised experience, it's more about showing you have the aptitude and cultural fit to become a successful long term employee in their particular firm.