Hi Dennis,
I hope I'm as active as u when I get there, not to many years to go……..
seems to me ur battling a very sticky wicket, with the w/shop door in the wrong place in regard to the house steps etc and the cupboards in the w/shop……..
How about a small door, wide enough for ur trolley under what looks like a window next to the original door, not sure on floor levels but looks close enough to get u on the patio with only a small slope…..u may loose a cupboard inside the shop but a small price to pay for safety and ease of use……supose the chimney stack can slip off if short on hight……
This way u keep the original door and enough room to move about…..plus it won't cost to much……..
.sorry can't be more helpful…..Clogs……
good luck to you and be careful………Clogs……