For my case, constructing the correlation matrix for all constructs from the meta-analysis is an impossible task because of: 1) a large number of constructs are incorporated; 2) the majority of these constructs are rather new/emerging in the field; and 3) the model involves second-order constructs which further complicate the situation.

Thus, if MASEM, path analysis, and regression are out of picture, what approach is available if I wish to compare the explanatory power across different groups of antecedents in my meta-analytical model?

Thanks a lot!