@Zac67
The only other solution would be getting a FastLane or a 4098 from GVP. I don't know if the GVP works with Buster9 but the FastLane does. On the other hand Fastlanes cost a fortune on eBay.
I just replaced the GVP 4008 in my rev 9 buster A4000 with a Fastlane. The 4008 worked flawlessly. The 4008 is Zorro II and rev 9 busters work fine with Zorro II cards. The Fastlane cost me $100 and another $30 for the memory. I bought it for the memory expansion and it didn't cost me so much, especially compared to what even an 040 accelerator would cost me that would give me a decent amount of memory. The faster SCSI is nice but all I use SCSI for on my A4000 is an external ZIP drive which lets me pass files back and forth between Winuae and my real Amigas.