The problem with small chairs is that they are small! That means they are more effected by uneven footpaths etc as a small change that barely affects a bigger longer chair, makes a small one tilt or rock (pitch and roll) faster and further. And these are the very same chairs that generally have smaller, solid, narrower tyres. And little to no suspension. So making it all worse. Then they have smaller batteries, lower power controllers, and weedier motors so stall out easily and are harder to control.
Make your doors wider. Get a bigger outdoor capable full sized powerchair. Seat height is really determined by the length of your legs as much as anything. Or you run out of footrest/ground clearance on curbs and ramps. Unless you plan on getteing better and not needing a chair then a
is a great investment!
25 years aco after an accident left me in a wheelchair I widened all the interior and exterior doors, made rooms bigger, and knocked down interior walls to give me S P A C E to move. Space to cook, to easily manoever. I go through all my doors at 6 or 7 mph even indoors all day long hundreds of times a week. Because in a chair its absolutely no good in a cramped small place. You will need to modify or move and then modify. Theres really no other option that makes any sense.