There is no comfortable way to use 32bit, but there is also the virtualization way. If you havn‘t upgraded to Catalina yet, but want to try Catalina, you can install it in one of the popular virtualizers. This might even provide some kind of integration into your host system, so you can launch the required apps directly in your host system. This of course can also be done the other way around. If you are on Catalina yet, you can still officially download Mojave from the Apple site and virtualize it.
You could also dual-boot. If you have an APFS drive, you even don‘t need to repartition, but instead use an APFS container.
Well, only workarounds, there is no nice solution. Catalina invalidates of lot of older software and hardware. I still have almost 200 32bit apps on my system. Many of those will probably never get an update (drivers, emulators, old games,…)