Anyone Convert Internal hub to 8-Speed Cassette?

Hi. My NOS Diamondback cruiser frame was built for an internal hub. Unknown what speed it's made for, maybe 7-speed.

I WAS gonna run an 8-speed internal hub with rear disc brake and 2.75" x 21" motorcycle tire.
I'm having tire clearance issues with the chain and seat stays. Until that's resolved, it's best to run a bicycle wheel & a 2.35 x 26" Schwalbe tire.
It's too expensive to have separate 8-speed hubs for bicycle rim and motorcycle rim, so I'll re-spoke the m/c rim to an 8-speed cassette hub.
When the frame clearance issue is resolved, then I'll have the m/c wheel re-spoked for 8-speed cassette.

Now the big question is:

Are there adaptors that convert a frame from internal hub to a cassette hub w/quick release and derailleur?
BTW, the dropout is 130mm wide. It was easy to slide in an 8-speed cassette wheel w/2.35 x 26" wheel.
Everything fits in the frame, including a 203mm disc brake.

Thanks for help.

I FOUND IT!!!

http://www.amazon.com/gp/product/B001PT8M8C/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1

For $1.53 and 17 of 18 positive reviews, it's da bomb! I ordered two!

The only negative review was that the item was black, not silver.

What a deal for me. I almost bought something other adaptor for $22 EACH plus shipping!

Thanks, but I want a disc-braked hub.

Besides, I got 11t/34t cassettes I need to use.

Wow. Thanks for the tip.

I didn't know you could replace skewers with solid axles.

My Sunrace derailleur adaptor arrived, and I installed it in a few seconds.

At $1.53, it is an amazing bargain!

Now to order the derailleur and shifter.

I ordered a Shimano Alivio rear derailleur and corresponding shifter. I also ordered a combination front deraiileur shifter/brake lever combination. The lever operates the rear disc brake. I will convert the 3-speed shifter to be the engine throttle.

I also ordered a Shimano 36h cassette hub with disc brake. This hub will be rebuilt with HUGE 9-gauge motorcycle spokes, rim and a 3" wide motorcycle tire.