I feel strongly that your comment regarding the "one-off" nature of a
Subaru EJ22 conversion is incorrect.  If the converting party follows
guidelines from KEP (Kennedy Engine) and/or has one of the available third
partys perform the conversion (H&R Motors, Tom Shiels, etc.), the result
will be a volkswagen van with a stock subaru engine.  Any vw dealer or
service shop can work on the van as a whole.  Any subaru service shop can
work on the engine.  If they say they can't, they don't understand what's
involved.  The subaru engine is left intact, including the Electronic
Control Unit, so the engine is running the same regardless of whether it
rests in a Vanagon or a Subaru Legacy.
Having converted my first vanagon, I have a good idea of the labor and
skills involved and feel that anyone with the interest can likely tackle
it, given the time, determination, and workspace.
You should try to drive a Vanagon which has been converted to Subaru EJ22
power (2.2 liter flat four engine between 1990 and 1992).  They are not
rocket ships but do feel stable and appropriate.  Like what the engineers
should have done in the first place.  Yes, you can pass and get up hills
without leaning forward, but you won't be taxing the rest of the vehicles
components because of hotrodding.
And, you boast that you have increased horsepower/torque by 50% while
increasing fuel efficiency by 25%?

Note:  I've got some decent info on my conversion on my website if you're
interested (url below).

Okay, sermon over.  Have a great weekend,
Brent
http://www.weidefamily.net/vanagon/