As phrases,I think they ate totally indentical. For example, "It's probably to rain."--明天可能下雨=明天有可能下雨.Here the phrases serve as adv ,they're equal. Another example ,"Everything is possible."--一切皆有可能。Here ”有可能“is not a phrase, but the character ”有" acts predicate verb ,it is individual from "可能“.In this condition ,“有可能”can not be replace by "可能”. Maybe this is the difference between the two.

Hi , Your idea is interesting.but it's a little difficult to achieve . Because ,many times ,one Chinese character can match two or more pinyin,besides one pinyin can also match more than one Chinese characters, so you see it's unrealistic to do so. You can only let others understand you well in characters.However, in the beginning ,you can write short pinyin sentences which can be understand easy ,others can change them into characters.I think this may be easy to realize! Hope these is useful to you,good luck!

北京的暴雨

我之前在北京呆了三年的时间，然后昨天在暴雨中回来了一趟，来出差。还记得06年和08年的夏天也下 过暴 雨，下得很厉害，但是那两场暴雨没有这场的厉害，连这场 这场雨导致10多个人死亡。我来的时候，东城的街道没有水灾，洪水 被淹的情况（从新闻，微波上都看过到了），就是说还可以走路没问题。可能是市外的情况比市里的要更严重 得多。听说房山，石景山洪水很高 猛.... 你们呢？在北京的人说一说你看到的东西，经验   经历，感动，等

 

I'm not in Beijing ,I heard the bad news from TV news.I saw a lot of people was trapped in the torrential rain and some arterial streets became rivers in a very short time! It's really unimaginable!