You can buy an e-GPU, if your device has thunderbolt and isn't an M1. Compatibility isn't great and it is obviously more expensive, but it is more or less what

You can buy an e-GPU, if your device has thunderbolt and isn't an M1. Compatibility isn't great and it is obviously more expensive, but it is more or less what you suggest, with the limit that you can only use it with one computer at a time.