I am not poskinim here
But I do see the Sedar as a big problem comming up, Ive seen OTD people remark how they have “suffered” through a Sedar.
Perhaps this year maybe you can change your Sedar slightly. Maybe Speed up (and I mean SPEED UP) some parts and slow down others in order to get him to stay. Better to have a Speed Seder with him there and not complaining that any other option.