Circumambulation with the Lulav within Thirty Days of Mourning for a Brother

Mourning for his brother within thirty days (when the festival canceled the seven-day law), can he circumambulate with his lulav around the bimah?

He can circumambulate as usual, and it is preferable that he takes the Torah scroll and stands at the bimah.

The Rema writes in Siman 670, paragraph 2: "One who experiences mourning during the festival does not circumambulate; likewise, during the twelve months of mourning for a father and mother (Kol Bo), and this is the custom." The Mishnah Berurah there in SK 9 writes in the name of the Gaon that this is because it is written "and you shall rejoice before the Lord your God," and this is during the circumambulations. In Beit Yosef, it is written about this custom: "It is astonishing why they should lose the circumambulation, and it is customary to circumambulate even for the mourner himself." The later authorities are divided on whether it is also appropriate to be stringent in the thirty-day mourning for other relatives. The Levush, PMG there, and Bechor Yosef in SK 10 write that one should not circumambulate. However, the Dagul MeRevavah there, as well as in Shut Teshuvah MeAhavah, part 2, Siman 285, and Kahat in SK 19 write that even according to the Rema, one should not be stringent in this for other relatives. In addition to what is written in Chayei Adam (Klal 148, paragraph 19) that one who circumambulates while in mourning for a father and mother during the twelve months does not lose, and the reward for the mitzvah is in his hand. Also, in Shut Divrei Malkiel (part 2, Siman 91), he wonders about the custom of the Rema, it seems that it is possible to be lenient with other relatives.