Assuming you have your ATP-CTP + written done, there are a number of places around the country that will prep you for a traditional ATP checkride in a twin and help arrange the DPE so there's no delay. If you have all the ATP minimums and just need to polish your multi flying and go over all the ACS areas, PM me. I know a place in Florida that has a DPE who gives them a block of dates each month to use as they need. So there's rarely a wait to get checked out.