If you consider “Guide us to the straight path” in isolation then yes, it could mean the journey or anything in which somehow a ‘way’ is implied. Guide us to the straight path to defeat the enemy, to conquer this or that. However when you contextualize it in Surah Fatiha, then the ‘way’ is only one! Allah is not refering to the straight path to Jerusalem.
Again context is important. Language is full of metaphors and similes. Of course, if i literally translate it that i will see a grain of ‘sand’ then im utterly mistaken. If you interpret it outside its metaphors it will loose its meaning. So you ‘will’ have to look at it through one interpretation.
‘Truely, those who swear allegiance unto thee, swear allegiance only to God. The Hand of God is above their hands’ 48:10 Is this verse open to interpretations? Can we interpret that Allah has tangible Hands? Or should we establish its meaning through metaphors? If your consider the metaphors, Hand hear means Power/Authority etc but you cannot interpret is outside the boundaries of metaphors which will render it meaningless and lead to kufr.
True, but we should have an umambiguous reason for doing so. For example in case of metaphors.