How to use ADWIN with multiple columns
This is not currently implemented. So while you can add any number as a concept value, you're probably best served by adding 1s and 0s depending on whether a not misspecification occurred. 

The reason it is not implemented is probably that ADWIN essentially performs a statistical test (or a heuristic approximation) whether the mean of two (large enough) windows is significantly different. And comparison of multivariate mean vectors is very tricky, in particular if one cannot make any assumptions about normality etc. 

Otherwise, your workaround of using 4 drift detectors seems like the best solution!