We never used a regular wheelchair except for in the airport. What my husband used before getting his power wheelchair was a fold down electric scooter. The brand was Luggie Elite, I believe. Inside the home, for safety purposes, he used a cane, then two walking sticks, then a walker, and now a PWC. The best thing you both can do is to try to make sure your husband doesn't fall. Falls can hasten progression of ALS.
I'm so sorry about your husband's recent diagnosis. I remember those days of stress and uncertainty. Those days still exist, but we find a way to adapt faster now.
Hugs to you both