Just post your answer immediately after you post the question. Like you say, phrase it as a request for comments to improve your solution. Your intentions are clear --- I wouldn't think you were trying to generate reputation. Besides, it's my prerogative to reward or punish your efforts. Alternatively, you could mark your answer as a community wiki if you are feeling charitable.

You can [now](http://meta.stackexchange.com/questions/132886/what-is-this-answer-your-own-question-jazz) do this automatically by ticking the “Answer your own question” checkbox when posting the question, provided you have more than 15 reputation.