One thing about Axpona is that it is often difficult to find the specific model you are looking to demo. Dealers do not like to lug so much hardware and the rooms are small to begin with. Even dealers that have multiple rooms still select only a few models of speakers to display. Unfortunately I doubt that you will find a single speaker on your list.
Jeff Joseph usually has his own demo material but might allow you to try something off hours. Last year his demo speakers were the Profile model.
A dealer in Woodridge, IL (Holm Audio, 1/2 hr from AXPONA) is a Joseph Audio dealer but I do not think they have the Perspectives. They do however carry a wide line of PSB speakers.
Saturday Audio in Chicago is a Monitor Audio dealer and they are willing to set up any speaker in their stock for you to demo.
All this is not to say you should avoid going, it is a great experience and you get to hear a wide range of products, get familiar with the different "sounds" and products, some of which may surprise you.
I have gone a few years now and was disappointed at the limited models available for demo. But I did hear Harbeth speakers at the Vinnie Rossi room and knew I had to have them. I went for a demo at Decibel Audio in downtown Chicago and bought a pair. Based on the speakers on
Good luck!