A couple of thoughts. How easy is it realistically to semi retire? When we explored part time options during the busy early years of parenthood, in our fields the options were few and far between, even with the benefit of parental leave being available to us. Maybe the public service allows for this flexibility but in my world people work full time with potentially one day a week parental leave. Anything truly part time was very junior and wasn't at all attractive due to lower salary.
Secondly on downsizing. It seems fine in theory but the lack of people actually doing it gives me pause. The lack of available properties and the energy required to move seems to be the biggest blocker. Equity release for retired people switches on and off so isn't always guaranteed to be an option.
So while I would factor both things into your plans, their weighting would be far lower in terms of them actually being able to deliver an income in time or money.
Secondly on downsizing. It seems fine in theory but the lack of people actually doing it gives me pause. The lack of available properties and the energy required to move seems to be the biggest blocker. Equity release for retired people switches on and off so isn't always guaranteed to be an option.
So while I would factor both things into your plans, their weighting would be far lower in terms of them actually being able to deliver an income in time or money.