Basically, you're going to be fine. Remember, "lagering" is just a long cold-condition, which also takes place in the bottles. I wouldn't worry too much, just try not to shake those kegs up too much on your way home. That said, I'm not sure I'd make lager beer if I didn't have the setup for it at home, as it sounds like you're maybe working harder than you have to.
Regarding your O2 question- I simply siphon the beer into a keg then purge the O2 from the top after pumping a few psi of CO2 in the closed keg. Easy peezy. I personally would not prime the keg with any additional sugar, you want that beer to be dry.