This could be an option, I was able to get them funded in the UK there are a few types one that attaches to a wheelchair and there’s another that has a seat on it that folds up. It was easy to train the carers but they still need to be able to guide the machine. if the concrete steps are stable it could work.
https://www.invacare.co.nz/products/power-mobility/power-add/alber-scalamobil