"Is this doable?" Of course, the question is more: WHY the hack would you want to do that...? Staying overnight or for a couple of days is hardly a drame and more convenient. Flying to Udon is cheaper, BTW, and as others have pointed out, flying to KL better and no visa BS.
"I sent them a picture of the car and motorcycle to be used for crossing land borders." 555, lovely ! "But every consulate and every immigration office is different in Thailand. They like to make their own rules up." Yup, fucking idiots..., no need to obey...! Boycott this scumbags....!
SCAM!!! SCAM ! Check the "about" page and you can clearly see it's a SCAM ! No name, phone number or address... and you want to send them money....??? LOL ! :-)
WRONG ! Either you didn't listen carefully or the info was wrong altoghether... Only 2 LAND BORDER visa runs PER CALENDER year is the rule, flying in not restricted.