Hi everyone

I am quite new to the bike game, so excuse my ignorance

I want to go on a big trip riding from a location in Europe heading east as far as I want to go.

I am living in Denmark but the registration tax is unbearable here. The bike I want (Kawasaki VersysX 300) costs 10.000 USD in Denmark but between 5.000-5.500 in other EU countries such as Spain or Germany.
Therefore I somehow want to get it registered there instead. Furthermore, I plan to ship the bike back from whatever country is my last destination to Denmark without registering it in Denmark and then later pay the huge registration fee when I have the money (maybe I just want to sell it, probably not but maybe )

I have heard about export plates (Ausfuhrkennzeichen) in Germany which can be valid for up to 12 months (I am gone a maximum of 6-7 months) but I am not sure if they are valid in non-EU nations.

My father's partner is Spanish but lives permanently in Denmark, she has a house near Valencia (which no one lives in). Is it possible for me to change my address to this house and then register it there on normal Spanish plates?

I hope someone can enlighten me a bit, I have researched this quite a bit but can't find any concrete official sites that help me..

Edit: I have not purchased the bike yet, I plan to purchase it in whatever country I plan to register it in.

Best regards, Jesper