I believe you can always teach an old dog new tricks. A power vessel such as trawler, motor yacht or whatever would be the way to go for comfort. Finding the right vessel for you is always the key which I am sure you all ready know.
Research different vessels and find two or three that you believe will fit your needs. Then charter those vessels and see how well they fit you. As far as learning the systems. You will in time, so do not worry about that.
Best of luck to you Mate.