I'd recommend hitting up a local bike shop for recumbent bike options. Since product availability is pretty location specific, only this general advice is helpful. Even recommending a particular website may not be helpful depending on your country of residence.
Regarding handle bars: your entire position on your bike is going to have changed in the 10 years of recovery (welcome back!). Getting your bike professionally fitted is well worth looking into. I did so after getting hit by a car. Not all bike shops offer this service though so it may require some searching online to find a place that offers fitting.
Generally speaking, you will probably find a more upright position more comfortable. That means raising your handlebars and possibly pushing your seat forward. Raising your handlebars can be done with spacers as well as purchasing a new stem with a steeper angle. It's best to get these options dialed in in real-time with a professional that you can give immediate feed back to.
Regarding handlebars specifically, refer to @Criggie's comment. Handlebars are generally system specific and would require more than just swapping the bars.