We are doing MIST/LISA from 24 weeks onwards. We use sucrose en facilitated tucking, wich works fine in most of the cases, and, if necessary (rarely), atropine. We do not use any other premedication except caffeine, of course. But it remains an issue. If a baby is too vigoruous we switch to INSURE with propofol sedation. The colleagues in Leiden use propofol, 0,5-1 mg/kg I think. They published a paper in 2018: https://pubmed.ncbi.nlm.nih.gov/30068669/
Thanks for sharing the video. In Rotterdam we use special MIST/LISA catheters from Chiesi (we are aware of the reported problems with the tip) and Vygon. This is, in our experience, (also in combination with videolaryngoscopy) even less invasive. Considering there is no need to use a Magill forceps.