"however fleeting" is a correct and usable phrase in written English.
You can use it to describe something that is short-lived or transient. For example, "The joy I felt was powerful, however fleeting."
The prospect, however fleeting, of a train.
Their bright colors, however fleeting or illusory, will be missed.
But however fleeting reactionary fads may be, they can have an impact farther down the line.
Traveling the county, I found a variety of escapes, however fleeting, from winter.
There is comfort, however fleeting, in the right words – and in his son.
– and talk of brilliance, however fleeting, will soon hover obligingly in the ether.
Abbassi lowered his head and exhaled because his dream, however fleeting, was still alive.
She let herself feel loved, in love, immersed in their particular devotion, however fleeting.
The fellowship of the bag provides a tacit solidarity, even an intimacy, however fleeting.
Older children roam the village on their own, exulting in their independence, however fleeting.
We need some reminder, however fleeting, that there was a time when the natural order prevailed.
