One of the best ways to halogenate safrole is by the use of DMSO and Sodium Halide with a little conc. sulfuric acid.
There is a wealth of information available on this proceedure, just UTFSE and also check out
https://www.thevespiary.org/rhodium/Rhodium/chemistry/halosafrole.txt (https://www.thevespiary.org/rhodium/Rhodium/chemistry/halosafrole.txt)
Hope this helps,
...Anansi