I dont know if this will help, but I will still post it. Maybe it will. In our folk songs, there is a dance called chardash (hungarian origin; I think). Modulations abound here. For example, first part of the verse is in C second in G then F... like this.
C,G, C/G/C/D G,D, G/F# F,C... And so forth. Afterwards, it goes to d and so on.
Maybe it will help you out. Dont know. Hope it will.