Come to think of it, another way of hour building is to get an FAA 61.75 "piggyback" PPL and do the grand tour of the US.
If you factor in the difference in fuel price, taxes and such you may find that a tour of 20+ hours may well be so much cheaper over there that your flight to the US plus the necessary paperwork is essentially free.
And the US is much better equipped to handle this kind of touring, with virtually no landing fees and FBOs at each field who will go out of their way to help you, to get the fuel sale.
Finally, something else. Once you've got your CPL/ATPL and are applying for the airlines, they'll probably be looking not just at the quantity of your flying experience, but also about the quality. If you just burned holes in the sky for hours, flying back and forth between A and B, you're not nearly going to be as interesting for them as someone who did the tour of Europe, then did the tour of the US, did a mountain flying and an aerobatics course, learned how to fly floatplanes and taildraggers, did some gliding, and did a whole bunch of other stuff to enhance flying skills in the same amount of hours. All other things being equal of course. At the very least, it gives you something to talk about, and be excited about, in the interview.