Frankly I'd say don't do it!
While my mother's been in hospital recently I have passed the time talking to two different men who live with their mothers and did just that. However, at the end of the day, in late stage dementia most patients will need to go into a nursing home - often after a crisis lands them in hospital - and when that happens, your Carers Allowance ends and you find yourself having to look for a job again (sometimes not easy if you're not a spring chicken yourself).
Care packages seldom work for people with dementia in my opinion - so to anyone who has savings or can sell a property/consider downsizing I'd say do it so you can then make your own choices and start thinking about residential care independently from social services and the nhs!