I do not see any issue with the replica and it is also important to consider that keeping on site and referring the global content to all sites may complicate the situation when local site might get updated the content specific to their locality.
I have to create One Global site and Many local Country sites. Currently the global sites is almost 90 % identical to Local sites with +/- few features.
what is the best approach for MSM with respective to this scenario.
should create one En base site and then create two replica: One for global and One Local Master site from which the Live copies for individual countries can be created.