densitometer alternatives

I have been reading 'Beyond the Zone System' with the view to improve my 35mm and 120 negatives. However I am hampered by the fact that I don't have a densitometer, spot meter or a shop to build the holder and no intentions of buying any of the above. I realize that the system is really meant for individually developed negs but feel that alot of it can be adapted for improved negs of any format. I was wondering if it would be possible to get a roll of exposed 35mm film with a series of known densities to at least be able to approximate my values by eye. I think that if the steps were fine enough that it would be useful. Does anyone know of a service that could provide this film or would be willing to create one that I could then purchase? Thanks and merry christmas.

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