Back in the day, there were expansion cards that put an x86 chip into a Mac to run Windows. But that would only work on the Mac Pro. Depending on performance need, you could pick up a SFF PC or compute stick, or look to cloud-based solutions.
If Qualcomm can come close to ASi performance next year, as they claim, and MS does go all-in on supporting ARM, then some software vendors may simply have no other choice than to support the platform.
We're not even a year into a two-year transition. There are still a number of development tools that aren't yet ready for ARM. That will have impacts downstream. I hope that by this point next year, that situation will have improved, both for macOS and Windows. There will be some holdouts, and hopefully others will see opportunity to step in and pick up the slack. However, there will undoubtedly be some users who will have no choice but to switch platforms and remain on legacy systems. Omelet, eggs, and such.