I found the solution! It's not the one I prefer, but in absence of a proper swing away system, it's the best that I can find that doesn't screw with the mounting system AND it's within the weight range.
There's a bad thing - people who want it has to hop on getting this stuff NOW.
Here's the details:
ConFerr (who is now out of business) makes a fuel can carrier and spare tire adapter.
The spare tire adapter can be had with a 6x5.5 bolt pattern (which is what our H3's use). A picture from a supplier (who still has stock supposedly) is here:
http://offroadrecovery.zoovy.com/c=V...wV/product/G81
You then mate it with a ConFerr fuel can carrier. The fuel can carrier uses Blitz cans (not my favorite brand of fuel cans, but it's usable until I can figure a way to adapt a normal bucket type carrier to the adapter).
http://offroadrecovery.zoovy.com/c=V.../product/G8007
Total cost - about $120 after shipping.
If you want to even attempt sourcing this out yourself and not get it from OffRoadRecovery.com in Colorado, here's the part numbers you'll need:
G8149 - 6 Lug 6x5.5 ConFerr Blitz Spare Tire Can Carrier Mount
G8007 - ConFerr Blitz Can Carrier
And of course - a Blitz branded fuel can. Be aware that the NATO 20L clamshell welded tanks (the ones I tend to personally use) are NOT compatible with this setup.
As soon as my stuff arrives, I'll take pics of the mounting and post it.
FYI - Steve