Why can't you install Visual Studio 2022 Community as an additional copy of Visual Studio on your machine? I still have VS 2019 on my machine and can use either version. With VS 2022, you can produce an app using API 34. You just need to make sure your Android manifest has the following <uses-sdk android:minSdkVersion="25" android:targetSdkVersion="34" />.
It will produce a warning when you build it, but the warning can be safely ignored. Google Play will accept an API 34 app for at least another 12 months or more, so that should provide a reasonable buffer as you migrate to net9.0-android35
My app has never used Xamarin Forms, so I can't say you won't have problems using it.