Why cut all the theory nonsense out? Why not use this forum to generally hash out and ponder on what all the theory might actually involve? I mean, what harm could really come from inviting people to share their views and opinions, if only in the name of curiosity or even fun? What if someone had done exactly what I'm asking and had a wealth of information about it? I hope your 28odd thousand other comments on this forum have been more valuable than anything you've said on here.
Why not actually ask a mortgage provider how/if it could work? This will need to be in place before you make an offer therefore it will be an application for the full amount by two or more parties. I suspect that means if anyone defaults then the other party would be liable for the whole amount. Not a good idea.
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