It currently looks as if the “strict” requirement for TPM 2.0 will be dropped. This would make many older devices an option again. Otherwise, you can book the ESU package for Windows 10 from the Pro version onwards. Then you can at least get security updates for ~$120 per year.
Another option would be virtualization, but then your host should be a bit more powerful.
Another option would be virtualization, but then your host should be a bit more powerful.