I said kit. DIY kit. Basic front end conversion bracket set and whatever. Cheap to make, cheap to ship.
There are lots of older Class B vans for sale. Not everyone can afford $60k-$100k 'expedition' vans, but anyone can buy a $5k-$8k fully self contained Class B RV and either DIY or spend the $12K on a conversion.
Yes no one sells a DIY kit or is willing to do them, unless I put in an order for 11 of them?
And no one will touch a Chev or Dodge van either.
In the last 4 years I've had one question about 3rd gen 4x4 systems. I'd make a kit if I saw the market for it. Haven't seen the demand yet. Bring me a van and 10 others ready to put down deposits and we'll make a go of it.
Although I agree with you about legacy kits from companies who used to make them, etc there's usually a good reason why they don't.
Let's not forget that the whole after market conversion thing started with a need or an idea that wasn't being met by the OEM and someone stepped up and did it.
It may be your time!
I think SpencyG would have good input here. He totally reworked the front end of his van.