Cleavage of C-S bond

I have hexa(methylbenzenethiol)benzene I want to convert it to benzenehexathiol. Most papers cleaving the C-S bond of the R group use Na in liquid NH3. I would like to avoid the use of liquid NH3 if possible due to cost and handling issues. I have a paper, https://doi.org/10.1021/acs.langmuir.8b03938 , that does the same type of reaction with just Na and DMEU (N,N′-Dimethylethyleneurea) for substitutes SCH3, SCH2CH3, SCH(CH3)2. Is there any reason R= SC6H5(CH3) wouldn't proceed?