If you've used the Aqua and it works well for you, it should work just as well outside. Using a laptop running Karafun plugged into a projector and extra speakers means the Aqua is only being used as a mixer.
You didn't say what speakers you'd pick up for added volume. I'd recommend 1 or 2 of these for something small
https://smile.amazon.com/Rockville-RPG8BT-V2-Bluetooth-Wireless/dp/B0881VBHDG
Any upgrade to replace the Aqua would be a mixer like these https://smile.amazon.com/BEHRINGER-XENYX-1202FX-3-pin-Black/dp/B000J5Y214
https://smile.amazon.com/dp/B07XC3BHTL
And for mic upgrade I'd recommend something like this.
There are many other posts in this sub on this subject that contain a wealth of information including links. I would suggest reading some.
Since you already have the Kithouse the only thing you really need is a powered speaker.
I have this speaker in the 10" version and it works well for an inexpensive speaker and it's not too bulky to move around.
https://smile.amazon.com/Rockville-RPG8BT-V2-Bluetooth-Wireless/dp/B0881VBHDG