There is a way, but on the scene of the frame right now it's a dirt road. Basically, you need to write a shell that translates from SQL to Meteor Minimongo and vice versa. This is an impossible task if you are no longer a master of Meteor and Mongo.
There were attempts to write such an adapter. The most advanced I know is: https://github.com/drorm/meteor-sql . It can be used to play, but I do not think it is ready. In addition, there is currently no way to use the Meteor accounting system with anything other than Mongo. You must either use it in any case for user accounts, or abandon the great convenience that they provide.
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