I would replace the railings. Even if not needed by code, they add a finished look and railings are always welcome with more than two steps. Appreciated by any elderly or infirm visitors and adding to resale value. btw, the yew is one plant that cam be pruned back to the ground for a more manageable size. It will regrow but slowly and it is easy to keep up with an annual pruning to keep the plant in check. However, a heavily pruned back yew is not an overly attractive item and since this a highly visible entry planting, you might opt to remove or relocate.

You will probably want an ada compliant railing. This might attach to the inside of the more decorative railing. an example here: https://www.trex.com/products/railing/ada-handrail/ the more decorative railings can be too large to safely grip. Some manufacturers offer this secondary rail. Our code required 1 compliant rail but we put them in all stairs if you go custom you might ask about ada compliance

Look up metal supplier in your area and get what you need. Just Google “metal railing fir two step porch”.

It looks like your house color is similar to ours. We used white for railings etc. but black for house and garage doors (see picture below taken last fall...) The porch floor is a gray color. We chose our colors based on the colors used on a historical house in the old part of our town. It was simple and goes well with most other things. I think it would work well for your place.