My mum has Frontotemporal dementia with PPA and strongly agree re the rare dementia support charity. They are a birlliant source of information and support. Another family member went to an all day seminar they ran on PPA recently. I think something similar would be useful to you. Aparently it was quite focused on early to middle stages which is not relevant to us. Mum has now had it at least 15 years and is 71.
I so wish there was a road map for any kind of dementia. As far as I can tell, and perhaps more so with rare dementias, there is really no way of predicting what comes next or what symptoms anyone will experience and at what stage. I think it can also hugely depend on your age and your physical health.
I can give you a full account of the pathway the condition has taken for us of you would find that helpful? Some of it will be scary and some of it will be really reassuring but none of it will necessarily be relevant to your husband and the next stages for him. Everyone is so different.
My mum's now in the late stages and needs round the clock care, which I moved in to provide. Her speech makes no sense at all but her tone is usually clear and we find ways to comunicate with her. She knows how much she is loved. She doesnt know who we are but she knows we're hers and she is very loving. She has a full life despite the difficulties. She still smiles and laughs
We've also learnt that with every bit of progression (new symptom or existing one becoming less manageable) we can adapt and manage. We find solutions one way or another and make it work. There have been so many moments that felt like disasters but they've become stories that remind us that we can cope with anything!
Do you have family/friends that are supportive? I'd also recommend the Alzheimer's society for support, information and advice. Joining a support group is also valuable for you. The more you put in place now, the more resources you'll have for when you need them. Its also worth getting involved in research, both for you and your husband as it can add to the resources available - I recently did a rare dementia carers research project and it was testing out a whole load of information and resources for carers.
Sorry this is long and I'm not sure I've answered your question. Do post again in this thread and give an update or ask more questions.