converting a road bike (aluminum with carbon forks) handle bar
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.