Anyone done an accessible bathroom for elderly parents from overseas?

My parents are getting older and still live in the Palo Alto house I grew up in, and my dad has been having a hard time with the tub in the hall bathroom so we're finally looking at aging in place and accessible bathroom remodeling in Palo Alto . The thing is I'm in Dubai and my sister is in Singapore, so neither of us can be there to supervise or even help pick out grab bars and walk in showers, which feels awful. I found kitchen bath palo alto while trying to understand what a proper accessible remodel actually includes beyond just adding a bench seat, and now I'm realizing there's a lot we haven't thought about like doorway widths, non slip flooring, and whether the toilet needs to be raised. Has anyone here managed a project like this for their parents while living abroad? How did you make decisions without being there to see how they actually move around the space? And did you worry about them being stressed by construction noise and strangers in the house? I'd love any practical advice because I want to get this right the first time and not make my parents guinea pigs for my guesswork.