Done it before
Most reliable way in my opinion, is to route the clutch sensor through the shifter via reed switch. I’ll explain.
Your car starter motor won’t work because it is interlocked to the clutch. You can ground out the clutch and the remote start will work normal. But that’s a bad idea IMO because you have to remember to keep the car in neutral, and also you can start the car in gear with the key too. It’s just a bad idea all around.
So what you can do is ground out the clutch through a reed switch that is active only when the car is in neutral. You do that by installing the reed switch in the center console next to the shift lever, and epoxying the magnet to the rod of the shifter. Tune it until the switch is met in neutral, but not in first or reverse.
For the wiring, you ground one end of the wire locally, then route the other wire to the clutch sensor and tap it in to the right wire.
The net result is that the car doesn’t know the difference between a depressed clutch, or the car in neutral. Either case, the car will start. Key or remote.
More importantly, when the car is in gear, then the clutch sensor will prevent the car starting, key or remote.
There are other ways to do it I am sure, but none as elegant, simple, and safe as this way. If there is, I haven’t heard of it yet...