Migrate from Git to SVN
I suppose you have no choice but to lose some of your git history - SVN just can't handle that much information.
The only hack I'm thinking of, for delegating problems to a third party, would be to take advantage of GitHub's SVN support to ease your task.
I'd recommend you to really think if you need to keep your history at all, or how complete it needs to be. Based on that, I'd just squash/rebase the conflicting commits (or the whole history in a single commit) and start off from that.
May the fork be with you!
Well, you must take a look at this question. Best answer is:
The general problem with doing conversions this direction is that Git repositories can contain more than just a linear history of revisions, as Subversion would expect. Multiple ancestries with divergent histories and frequent merge commits are all possible, which can't be easily represented in a Subversion repository.
For simple cases where you do have a linear history in your Git repository, you can use git-svn dcommit to push the lot up to an otherwise empty Subversion repository.
Best regards.