Nope. Once you choose to duplicate a lower level spell, the result is going to be a lower level spell. The text in Wish is more specific than the general rule about spell slots. My opinion on the matter of duplicating spells with Wish, is that it is not considered casting the spell with a 9th level Spell Slot.
Can wish replicate a 9th-level spell?
-> A spell you duplicate with wish can be cast at a higher level, as long as that level is no higher than 8th. You still expend a 9th-level slot, of course.
Do you need to make a wish spell?
You don’t need to meet any requirements in that spell, including costly components. The spell simply takes effect. Alternatively, you can create one of the following effects of your choice:
Can you use wish to allow yourself to cast wish without risks?
Can you use Wish to allow yourself to cast Wish without risks? The stress of casting this spell to produce any effect other than duplicating another spell weakens you. After enduring that stress, each time you cast a spell until you finish a long rest, you take 1d10 necrotic damage per level of that spell.
Which is the mightiest spell a mortal creature can cast?
Buff (…) Wish is the mightiest spell a mortal creature can cast. By simply speaking aloud, you can alter the very foundations of reality in accord with your desires. The basic use of this spell is to duplicate any other spell of 8th level or lower. You don’t need to meet any requirements in that spell, including costly components.
How long does it take to recover from a wish spell?
For each of those days that you spend resting and doing nothing more than light activity, your remaining recovery time decreases by 2 days. Finally, there is a 33 percent chance that you are unable to cast wish ever again if you suffer this stress. This consequence ensures that the players can’t exploit this spell, at least, not too much.
