['Hello! What are your thoughts in Scandinavia?', "I would like Sweden.  In exchange, I would offer up that fleet as a proxy unit for you.  Want some help into Skag?  You got it.  Want me to help you into North Sea after I take Norway?  It's all yours.  Thoughts?", 'Hello! So it sounds like you are already planning on taking Sweden and Norway. I will confess that a strong Northern power makes me uncomfortable. If you are planning on taking Norway, you are probably committing your army in Moscow to St Pete this year then? That makes you awfully vulnerable in the south.', 'I thought we might work together?  If I took Norway with your help, we could DMZ Scandinavia - which would allow me to focus on the South.', "Anyway, that's getting way ahead of ourselves - I can't fight on two fronts, I'd rather work with you in the North and focus on the South."]
I'd consider that if you didn't build at all in St Pete. Let me talk to France and get back to you, since I would clearly benefit more from this in an EF alliance than an EG alliance, and France has yet to say anything.