Hi
You can say it, but you have to be careful if you omit prepositions in conversational Englsih:
- I fancy (for) myself a hotdog
[= that is what I would like]
- I fancy myself (as) a hotdog
[= that is what I would like to be - ?!]
That is why the sentence does not work - it is going to sound funny
You can use commas:
- I fancy, myself, a h