Take note if you have tire trouble on a long trip you will spend way way way more money than a different rim in a standard size will ever cost.
Lets run the numbers:
Towing charge off road to a shop =$150
( time to decide) tow bill 1000 mile home or motel rate as you are stuck waiting for someone to ship a tire to shop because no one in a 3 state are has your odd ball tire. Either way you are looking at on the cheap side $1,100, and high side $3,000
or
Purchase a standard wheel package front, and rear rims.