I'll make similar arangements.So I've made a decision and booked flights.
Arrival via FinnAir AY1392 DUS - HEL on Wednesday Jan. 24th at 15:10h.
Departure via FinnAir AY1391 HEL - DUS on Tuesday Jan. 30th at 07:40h.
MXM is so kind to provide shelter for the nights to Thursday and Tuesday and a seat for the drive up to the meet. Thank you.
24 hours driving is not so problematic, when I did it last time we were delayed by about 8 hours over the 24 by 4drian who got stuck in Germany with Ronja and some leaking something. We needed a sleep of about 1-2 hours at a cemetery in Lithuania before continuing.Take the night ferry between Sweden and Finland. You have to sleep sometime and you might as well be moving while you do so.
I personally have problems with sleeping during the day. The price difference might make it worth it though to take the day ferry.Well, you can sleep during the day as well. And day ferries can be less than third the price of a night ferry.