I see what you're saying.
Either way you are stuck.
I would buy from a reputable breeder who sells on PF but I probably wouldn't look there. I would not necessarily associate someone who lists on there with puppymills. I can see why that may happen though and it may very well if you list there. People are just worried that they are going to get taken.
I believe you are a reputable breeder and if I was looking for a Biewer, I would most definitely look at your dogs. Of course this does not a bit of good because the last thing we need right now is another dog.
Saying that to say, a lot of people are looking for an experienced breeder but not everyone puts much emphasis on it. I would sooner buy from a breeder just starting out that I knew was doing everything right then from somebody breeding their pet and just listing on YT because testing, etc. is very important to me.
Some very good breeders ship their dogs.
I don't like the thought of it but if I really wanted a pup from a particular breeder, I'd consider it. Transporting in the cabin for a fee seems a whole lot better. Maybe offer it for a large fee?
If I 100% trusted the breeder, I wouldn't have a problem paying by Paypal.