An alternative to Poznan as a refueling stop might be Zielona Gora / Babimost (EPZG). You will have the fuel truck all to yourself and be able to do one of the quickest turnarounds possible. It’s really sad because it is a very nice little airport with all facilities, recently renovated buildings and absolutely no traffic at all.
Vantaa EFHK is a slot AP but has lot of hangar space. Hyvinkää EFHV has no Jet fuel no hangarspace and rw can be snow cowered.
Recommend Malmi / EFHF.
You may not need hangarage just to avoid de-ice – it’s been reasonably “warm” recently and looks to continue the same.
So the trip takes place tomorrow.
EGTK – LFMN in the morning.
Evening LFMN – EPPO (needed due to time of arrival)
The EPPO – EFHK (needed due to late arrival sadly)
A long day – 1942nm.