Can I inspire my sims instantly without using cupcakes?

It takes me about 2-3 mins max to inspire a house filled with 10 Sims. I'd consider that reasonably instant if I'm honest. Otherwise, I don't know of any other way to instantly inspire without using cupcakes. If there's a cheat out there, I don't know it, but hope someone else may be able to help you.

This worked for me. Get all your Sims in one house.
Then go to setting and change the date to 2013. Click
The home button 2 times and delete the Sims FROM THE
BOTTOM Bar!!!!!!! Then go back to te Sims and all your
Sims will be inspired. Hope this helps

To inspire my Sims I just make them use the computer

I have an idea to inspire the Sims I HAVE NO IDEA

There is a singing fish in the DECORATIONS section of the HOME STORE. It costs $1500 Simoleons. Have your Sims Dance to the "inspiring song" for 30 seconds, and they become instantly inspired. You can use this fish as many times as possible, but you have to wait 30 minutes before using it again. There is no limit as to how many you can have per house. So I usually buy the same amount of fish as the amount of people in a house.

If you go to the electronics tab, you will see computers and tvs, if you look on the lower right corner of each of those, you will see that it has the "inspired" icon. Using any of those will inspire your sim. Hope that helps!