I will try the AlI3 as well as the LiCL to demethylate
To methylate I'll use the
Methylenation Of Catechols with Dichloromethane in DMSO
as for the PTC, I bought TBAB, C and I (Tetrabutylammonium Bromide, Chloride and Iodide)
I know I2 is not OTC on the US of A, but my supplier's brand even has the method they used to produce it
(Panreac Brand) - from Chilen Nitrate
2NaIO3 + 5NaHSO3 ---> 3NaHSO4 + 2NaSO4 + I2
Hope this helped