From this question, it's clear that there is a halachic requirement to do a "good" hagbah. This one emphasizes that, by saying that a gabbai who knows the individual can't do a good job shouldn't call them.
Given that, if there is only one person in the congregation who is capable of doing a good hagbah, should they be called twice on a day where multiple Torahs are used? All three times on Simchat Torah? Can they be called for an aliyah in addition to hagbah (even when there's only one Torah)?
