There are places you can rent them. I googled hand cranked film viewer and got a few in my area. I don't know where you are, but maybe there are some near you. Try googling

I'm another who doesn't understand what the problem is. We put our airswitches in just about the same location and find it very convenient. I sometimes turn the water on just before running the GD and usually turn the water off right after turning the GD off so it is convenient to have them close to each other. Occasionally some water drips on the air switch but that's okay - it either air drys or is dried off when I wipe the counter. My hand usually isn't so wet as to leave a whole lot of water. If it was, I would have to wipe the counter anyway. By the way, even if the airswitch isn't by the faucet, it will sometimes get wet because of water splashing when spraying something in the sink. What problem do you think the water is going to cause by being on the air switch that it won't cause by being on the counter? If your water is hard and leaves water stains it will do that to the counter too. In that case, it might be best to turn the handle to the front to keep the drips in the sink. Or you might try it this way for a bit to see if you like it after all. You can always change the way the faucet handle faces later. Since many people like their switch in that position, I don't think you can fault your installers. If you had a strong preference for layout, you should have been there or left detailed instructions. Delays put our granite install when I was going to be away on a business trip and even though we had discussed things and mocked-up the accessory layouts, my DH wouldn't let them drill the holes with me away. They came back so we could both be there and we could make in case last minute tweaks to the layout were needed.

Aging in place" is a general catch-all phrase that is not realistic as you won't know your actual needs as you age. You think you can plan but realistic those things that you do may not be enough or overkill in the long run. I've been going through this with both my elderly parents and my partners who are in their mid 80's. Both sets still live in their homes but both have very different needs for aging in place. To have outfitted their homes for "aging in place" earlier in their lives would not have necessarily met their needs now or would have been overkill. What we've done to help them age in their home has been done as they needed it. Grab bars for my parents, not my partners. Rug removal for my mom's walker, rugs still are down in the other parents home. Hand rails added at entrance at one parents home. I don't see these as "aging in place" but to address their current actual needs. My partners parents live in a 3 level home but at 87 yrs old they can still manage the stairs. They built this house in their mid 70's and when we discussed aging in place during the build, they told us that if they got to the point of not being able to use their house, they would move. They were more concerned about building the home they wanted and not concerned of what "may" happen in the future. A few years back I was going to build a home with "aging in place" in mind. To achieve this, this included, bathrooms basically doubling in size and wider hallways to accommodate a wheelchair, if necessary, and zero steps in the garage to the house. Realistically if you want a "AIP" home, isn't this really a home that addresses the same issues as a home for a person with disabilities, especially with one to accommodate a wheelchair, so are we just trying to reinvent the wheel or just adding a fancy name to it? My take away from my experiences is that if you want a home for "aging in place" have a single story house and deal with the rest when the time comes. As you may find later on that you what you thought your needs and wants would be for when you got older are no longer the same. You may find yourself wanting a different type of life style and/ or house situation or even a different city or state. Active Senior Retirement Community or condo, anyone?

So your hands are covered in onion scraps and juice and you have to grab a cabinet handle, lean down, flip a switch, flip it back, and grab the cabinet handle to close the door. Nasty onion and juice all over. Or poke a button at the sink with one finger. Your call.