Please don't take offense to this, but I applaud your choice to go with a humorous tone for this video because it can certainly be a little "dry" and confusing for those less savvy than yourself.
Anyway, I always jump at the opportunity to adapt a script humorously. I will list my experience and credentials below. As a general rule, I make sure to provide the value first (i.e. what I will do for your project), and THEN dither on about myself.
That being said, here are just a couple of mini-samples to give you a sense of what I could contribute to your video script:
"Introducing the most historically successful form of (legal) tax evasion - the IRA."
"Did you stumble upon the next Apple or Microsoft? With a Roth IRA, you can withdraw from your (massive) gains without a penny lost to federal OR local governments. What uncle Sam doesn't know, doesn't hurt him."
Okay, now the boring but important stuff. I've written, proofread, and edited more than 600 pieces of content across all conceivable niches. This has included several video scripts for affiliate offers and company bios. Especially since you are providing written content, I am more than capable of adapting this into a concise, yet amusing video script.
Cheers and best of luck to you. I'll be available via messenger.
Nik