Don't know anyone that does lessons. But I think Jesper from Simmer Style Australia in O'Conner in the past had some big Slingshot boards and beginner foils he would lend people to get the first two hours under their belt. Maybe give him a call:
simmerstyle.com.au/ You can also try Revolution Board Sports in Osborne Park. Don't know if they have any beginner gear available at the moment but they helped me out in the past as well.
To be honest if you are an intermediate or better windsurfer you should be able to pick up the basics in a couple of hours. Slingshot has a web site they the Foil Academy which will give you a break down of the basics. It's free:
www.foil-academy.com/There is also a pretty good video by Balz M?ller that helped me when I started back in 2020:
Lastly, there is a pretty dedicated and friendly crew of windfoilers at Dutchies and Point Walter in the mornings if there a decent Easterly. The OGs being JJ, Simon and Jonah. All of them gave me a lot of tips when I started.