You could start by using standard spelling!
Convince them of the advantages of adopting the different system. Possible selling points:
Convince them of disadvantages of not adopting.
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The sumerian system was based on 60; ours is based on 10
Televantage is a phone call system which links workers together. It enables people to work from different locations and is especially useful for remote workers.
There is no single conversion unless you consider a systemic to an evolutionary hotchpotch, mishmash as a conversion. There are different conversions for different measures.
A System
The Mayan number system is vigesimal (based on twenties)The Roman number system is decimal (based on tens)