Dns – How to redirect all HTTP requests to HTTPS when ISP blocks port 80

I am running a HTTPS web server at home but it has one key flaw: you can't connect to it using port 80. My ISP (Cox) blocked (incoming) port 80, there is nothing I can do about it, but luckily for me they did not block port 443. So, I have opted to use a pure HTTPS server, but this is not quite working, since I have a few things I want to redirect to my (HTTPS) server:

http://www.example.com/ redirects to https://www.example.com/

http://example.com/ redirects to https://www.example.com/

https://example.com/ redirects to https://www.example.com/

And finally, the roadblock: https://www.example.com/ points to (CNAME) powe.ddns.net, which is my dynamic DNS. I tried, but I cannot mix URL and CNAME records or make a CNAME only point towards a single port on an IP.

So far I have made all the redirects go to https://ww2.example.com/ and have that point at my home server, but with this I cannot make https://www.example.com/ redirect to https://ww2.example.com/ because I cannot do HTTPS to HTTPS redirects.

All the solutions I have found thus far rely on port 80 being open, which I cannot do. So, what can I do? Possible solutions include HTTPS to HTTPS redirects, port specific DNS, and from-HTTPS URL forwarding (I have only found HTTP to HTTP or HTTP to HTTPS URL forwarding). Thank you!