There are a couple of suppliers on e-bay who will make a vinyl tramp for the Getaway. I considered buying one in yellow from Chip at Whirlwind sails and decided to go with a black mesh tramp that he made me. The tramp he made me seems to be well made and fits well. The only minor complaint I have is that he stops the tramp about 5" short of the rear cross beam and he sews on a line catcher to cover the lacing line, as compared to the Hobie tramp that actually stops under the beam and looks cleaner. I am sure he would continue the length of the tramp and do away with the line catcher like Hobie does. I didn't know how he made the tramp until I received it, so I didn't request this from him. He did move the hiking straps outward almost to the hulls, so that I could use them while I am on the wings and he also added an extra line pouch for me. Because I weigh 235lbs. and sail with friends at times, I had him place the center grommets 4" on center, I did this because the original tramp that was 10 years old was in good shape, except that the mesh was tearing around the center grommets. I am hoping that this problem may be eliminated by adding more grommets down the center, reducing the load on each one. I don't know if it will hold up as well as the Hobie tramp did, which was left uncovered in Florida and Costa Rica it's entire life with the previous owner. I would have went with a Hobie tramp knowing that the fit would be perfect and the quality would be first class, but like you I wanted something that Hobie doesn't offer. Chip was easy to work with and was very quick to get the tramp made and shipped to me. Good luck with your search for a Getaway if you decide to go that way.
BTW, although I have never owned a beach cat before and after owning my Getaway for 6 months, I can't tell you how much I enjoy it. I sail it with friends, or with my wife and 23 month old daughter, but I also enjoy it when I go solo and it is just me the wind and the ocean. I have flipped it a few mile offshore and got it back up solo without any trouble. I am 6ft tall, 235lbs and turn 65 this year, so at this point in my life, I am not exactly what you would call a ripped jock. I only add this because I read so much about the Getaway being a beast and hard to handle solo. I have absolutely no trouble launching at the ramp, sailing and righting solo, but I will admit it is a bear moving around on the beach alone and for me that is only a problem because of the wave action and height of the tides that we get. If I beach it on an incoming tide, unless I pull it way up on the beach the first time which is difficult, the odd waves keep moving it around as the tide rises, I am constantly pulling it up higher until the tide starts to go out.