Q. A shul that davens nusach S'fard (Ashkenaz) and in days when no tachanun is said, as in Chanuka, an Ovel does not usually daven before the amud (does not lead the services). This particular minyan like others, due to the covid crisis, is having a difficult time gathering a minyan for Mincha - Maariv, unless the Ovel with two sons join. Can they offer the amud to him so he will join them and no go to another Ashkenaz shul.
A. Mishna Berura (683: 1), rules that an Ovel even though, he does not daven Shacharis for the amud during Chanuka when Halel is recited, he may do so for Mincha - Maariv.
Horav Shlomo Miller's Shlit'a opinion is that although, in this particular shul the minhag is that he doesn't usually lead the services, if the presence of a minyan depends on his attendance, he may be offered the amud for Mincha - Maariv.
Rabbi A. Bartfeld as advised by Horav Shlomo Miller and Horav Aharon Miller Shlit'a