Hi LRR, welcome to the board.
I would wait until you have the chemicals that Glenn recommends. Liquid wrench and sewing machine oil are NOT the same chemical make up.
Why mess with success? Glenn's process works. I see no reason to modify it other than when chemicals are banned from sale like they were in my case. Alberta, Canada has banned the sale of denatured alcohol so I had to make a substitution but it was an equivalent substitution that Glenn agreed with.
Also, Glenn recommends and I heartily agree that it's best to start with a machine you have no emotional investment in at all. Featherweights - in my experience - don't occupy that niche for very long.
If you can get your hands on a $15 head that you can practice on first and get the hang of the chemicals, I think your FW would thank you for it.