Go over Reform's policies with a fine tooth comb and work if they really do align with yours, do a deep dive into this. Their policies are more pro big business than families. Bonnie Blue is a supporter, not exactly family values! Look into their Russian funding, one of their MP's was done for Russian involvement. Do you really want to be aligned with that?
The way the economy is, tax cuts would not be enough to lead to more SAHMs. The cost of living is much higher than that. I think the genie is out of the bottle.
Rolling back women's rights will include rolling back some of the rights that you want, and possibly your daughter's (if you have a daughter). If you think a SAHM and marriage is the ideal, what if this doesn't work out? I'm married to a good man but some of that is going to be luck. No one gets married to someone that they think is going to be abusive! Realise that like in America with Trump, rolling back other people's rights will in the end mean rolling back your rights. It's great that your choice as a SAHM has worked for you, and I do agree we need more family time - but do you realise that it is costs and the way that work is more pressurised that make that more difficult? And Reform are pro-business, with less workers rights and are more likely to make families more precarious with less time for each other? There is no way that Reform are going to be able to enable everyone to be a SAHM, that ship has sailed, we aren't going to be able to go back to sole earners with their policies. They wouldn't be able to reduce housing costs by the 75% that would enable that.
Wouldn't the Scandinavian version of better parental leave, better funding for childcare and education and a more equal and fair society that benefits everyone, not just the top 10% lead to better outcomes? Read The Spirit Level by Kate Pickett and Richard Wilkinson, and the Inner Level by the same authors to see why more equal societies do better on multiple fronts. The UK isn't an equal society and it's no surprise that we aren't doing well.
If you do want to support disabled people, Reform would be more likely to push benefit cuts for everyone, including the disabled - so they would lose their benefits too. Think outside your bubble, you are a SAHM with a high earning partner who probably has a comfortable life - think about how all of their policies would impact everyone. How would a reduction in workers rights affect families? Would it mean working less hours for less money? Would removing social safety nets mean if a husband loses his job, his family would become destitute? What happens to single parents? How about the idea that is opposed to the policies of Reform and the Conservatives that social housing with controlled rents would and did allow families to live on one wage?