Oh wow. So sorry, I thought I posted the work around for this a long time ago. Just realizing now that I haven't.
Unfortunately, you need the Xpac Dine out to make this work.
Take the venue you want Telesplosion to work in and change it to a restaurant.
Toss the basics on the lot to satisfy the requirements. Placement doesn't matter, you can put everything on the roof if you want.
When your done, save the lot and go to your played sim.
Have your played sim purchase the restaurant, then visit the lot.
Don't worry about setting uniforms or any of that stuff. Just go to the DJ booth and click to upgrade.
Voila .... option to install wireless display override now comes up.
When your done the upgrade to the DJ booth, sell the restaurant.
Go back to manage worlds, click the restaurant in build mode and set venue type back to whatever it was intended. (bar, nightclub, ect)
Delete the restaurant equipment. Save lot.
Visit the lot with your played sim and enjoy Telesplosion. Click the DJ booth, open control panel, enable telesplosion!
@FinalBossNyuma See work around above : )
(merge post) - Atic
