If you were to go to the Farm, I honestly can't imagine driving there & back (particularly back). If that's what you decide, traveling by plane would be best, and it might not be so much different in terms of cost. My reasoning: With newborns, you are nursing once every 2 hours; your body is still in post-partum recovery mode; you need lots of water and healthy food to be able to function. You don't know what the temperaments of your babies will be; my babies screamed bloody murder in car seats until we turned them front facing one month ago... as infants we rarely drove them longer than 10 minutes and only took them in the car if we absolutely had to (they just wanted to be in arms all the time). A drive xcountry with them... well, I just can't imagine it. The feeding & diapering of 2 newborns is exhausting in and of itself without driving for days at a time.
I like CJColorado's suggestion of checking out NM.
Also, have you phoned every HB MW within a 3 hour radius of you? Sometimes there are MWs who will go with you and fly under the radar... you could check on your tribal board for references. Good luck, and please keep us updated.