I think that there is no way of fooling the emulator without real 1541 attached!
Anyhow, what would be the gain if you *were* able to fool it? Load C64 games then? Nah! Don't even remotely think of that to work; instead, try to think "Amiga" and thus be aware that you will at least have a (pseudo) .device
driver that can handle C64 disk images etc.
The crucial point is that the *emulator* waits for data from serial port
if you type LOAD "$",8
or anything of that sort on emulator's side. So if you do want to make it load game images, you must write your own driver. 100% sure that on the real thing, there's no way to circumvent this; on the emulator, you could write a pseudo driver too that replaces serial.device (compare to uaehf.device
for harddisks!). Or ... or ...