@BigBallsSettler You can transfer in App purchases from the Catan Classic app to Catan Universe.
Create a Catan Universe account
Enter your Catan Universe account data in the transfer menu in Catan Classic (bottom right corner of the main menu)
A message will pop up in Catan Classic if the transfer was successful
Open Catan Universe and enjoy your expansions
If you should run into an issue while the transfer please contact us via firstname.lastname@example.org. We will be able to help you there more effectively than here in the forum.
Interestingly I've switched browsers from google to firefox recently and the issue seems to have stopped. Also my loading time has significantly decreased and the rate of bugs/glitches I experience is noticeably lower. Perhaps there is a browser compatibility issue with google?
You can unlock Seafarers etc. temporarily by using scrolls, thus gaining access to the game for 24h per scroll. However, there is no possibility to gain constant access to the expansions without paying for them.
Yes, regrettably this is still an issue when they make membership requests while you are offline. However If you are online when they make their request, you should always be able to see and confirm it.