A person who receives shlishi in Monday/Thursday and has to bentch Ha-Gomel may he do so before the Kaddish that is recited after Krias HaTorah or better wait until until after the Kaddish and recite it then before hagba?
Poskim have written extensively on this question. Some write that one should only recite the ha-gomel blessing after kaddish, and it is worthy practice to do so. However, according to the strict halachah there is no requirement to wait, and one who recites the ha-gomel blessing before kaddish should not be told off.
See Nesivei Halachah (2, 219, 6), who proves from the Kitzur Shulchan Aruch (69:5) that one should not interrupt before kaddish (the Kitzur Shulchan Aruch addresses the question of reciting the berachah on wearing a tallis before the kaddish after pesukei de-zimra).
However, other authorities do not agree with this ruling of the Kitzur Shulchan Aruch (see Darchei Moshe 54:1), and rule that even if the berachah on the tallis is recited before kaddish, one does not need to say extra pesukim, and the berachah does not constitute a hefsek. The same can be suggested concerning the blessing of ha-gomel.
Even if we assume the ruling of the Kitzur Shulchan Aruch, a similar result to the above can emerge from the rulings of the Magen Avraham (292:2) and the Mishnah Berurah (292:4), whereby there is room to suggest that birkas ha-gomel, which is customarily recited in the context of being called up, does not constitute a hefsek.
Therefore, although it is better to wait until after kaddish, it seems that there is no need to stop somebody who makes the berachah before kaddish.