26 grand is almost twice the usual price of 14 grand if you don't have enough in the bank. I have heard of a British agent in Pattaya who rips people off for that amount.
Yes, you can do the first part like that, but if you are leaving (as you have to) why not just fly to Penang or van to Vientiane and get a second SETV? That way you get 6 months and not 5 and save having to leave the country more than once.
After the 2 tourist visas, if you are really desperate, then you can start doing border hops until they tell you no more allowed.