Have you been able to see that Schwinn trike in person? Do any shops near you stock it?
Another style of bike you might consider are the so-called crank-forward models that let you easily put both feet on the ground. For example:
https://www.electrabike.com/way-to-r...oot-technology
These feet-on-the-ground style bikes provide a different experience from the more racing style bikes that have you leaned way forward. My daughter rides something similar from a different brand. She likes the upright position, and being able to quickly put both feet on the ground helps w/confidence.
Visiting some bike shops to see what's on offer might be a good way to begin.