I definitely feel for you. I think it’s really important you speak to your employer’s and I certainly wouldn’t say that you’d prefer to work at home. Instead I would use the phased return as an insight for how safe your workplace is… collate evidence and experiences as early as you can regarding how you are feeling, your conditions and your work productivity and hopefully your employer will suggest it’s better to work from home.
Feeling anxious and nervous about returning is perfectly normal. Just don’t give them a reason to give them the power to reduce things for you at your cost.
Just because things maybe safe for one person doesn’t mean it’s safe for all… and workplaces should be doing their best to make work as safe as possible. They should be abiding by equal opportunities too.
This is just my opinion and hope things go well for you.