I am sorry as I may be too late to help you, ref Oven for a wheelchair user, www.howdens.co.uk
do an "inclusion" range, all "Care and Repair" approved contractors, use Howdens appliances when using Disability facility Grants for adaptations, their oven is called a Lamona side opening door, single oven, one would normally set the oven at waist/chest height (whatever wheelchair users preference) and would have a pull out shelf under the oven, and to the left/right (whatever way door is chose to be hung) and the user then slides the hot food to the other pull out worktop shelf, and then close the oven door. the shelves of the oven are pull out, but are firmly attached to the insides of the oven, so the user does not have to lean in, it pulls out over their lap, so they can baste food easily. the whole ovens are "built in" and can therefore be sited at a precise height for the user,
If you google, nothing ever comes up for the disabled, in relation to appliances for the disabled, and when it does, they never show prices, howdens are the same I am afraid, one needs a contractor with an account for Howdens to get the prices, I AM having one of these ovens next week, but I do not know the cost, they WONT tell me.