iPad 2017 Keyboard Case With Hand Strap

I just bought an iPad 2017 (9.7", but not iPad Pro) today. I am going to be using it in my home inspection business. That means I will be crawling through attics and sub-basements with it and I will be using it outside in the rain. Also, because of the way I am going to be using it, I need an adjustable hand strap on the case, for easy, secure one-handed use. I would also like to add a Bluetooth keyboard, which obviously requires a keyboard case.

I have spent 4 or 5 hours today looking for a case that satisfies all of my requirements, but have been unable to find one. I have been on the website 18 iPad case manufacturers with no luck.

Does anyone know of a case for an iPad 2017 (supposedly the dimensions are identical to the iPad Air 1) that satisfies ALL of these requirements.

1. Must protect/store the iPad AND a Bluetooth keyboard.

2. Must offer good drop protection (I will be using it in a home construction environment and it will probably be dropped occasionally).

3. It must offer screen weather protection (the iPad will occasionally be used outside during periods of rain, I don't want the iPad damaged in this environment (if possible)).

4. It must have a hand strap (adjustable preferred) for easy one-handed operation.

I have found many, many cases that satisfy 2 or 3 of these requirements, but, so far, none that satisfy all four. I would be willing to use a combination of products, if that will work. For example, a case that satisfies requirements 1, 2 and 3, then add a universal adjustable strap to that case (if there are any straps that will work over a large case).

Does anyone know of any product or any way I can satisfy all 4 of my above requirements???

Thank You In Advance,

Bill Granger