I have only been in this game for 7 years and jumped into horses faster than most probably due. That is because I had horses loaned to me to get me started. (The 60k start up number to get in this game is way overstated, I haven't spent that yet in all the time I've been in the game) I can say if I didn't enjoy FT's I wouldn't have been dragging a bumper pull and my 2 dogs a few hours from home to sleep in a tent etc.
In my opinion if you want to get new people involved few if any will jump straight from no FTs to HB FTs. The HB clubs have to support the walking trials and organizations and figure out how to get some of the folks who run walking trials to come run some HB trials. Loan them a horse, get a wrangler or remove other barriers. Hold a walking stake day before a HB trial or on Sunday and try to get some walking guys there to watch on borrowed horses or gallery wagon. Help them with their trial to help both groups.
The other thing that is going to help get people involved is helping mentor them (I have had some real good ones). Offer to have them come train with you. Most folks especially new ones don't have access to grounds to train and struggle to compete or don't think they can without grounds to train on.
I sold a pup this summer to a new guy that had never been to a trial. I have helped him train along the way, loaned him my horse at trials and shared the knowledge others have passed on to me. He placed his pup in almost every stake he ran it in this past season. Now he is hooked but will need help over the next couple of years trying to train to the level of his first broke dog, and borrowing a horse for HB stakes etc.
You get new folks a well bred pup cheap, help them train, loan them a horse, and make sure they have a good time you got a chance of keeping them around.