You're right there. A bunch of unguided exposures of 30secs-2mins stacked give very good results and you'll have fun with them.
I'm not convinced though that the EQ3 is a good choice. Not even in the beginning. I'd get an EQ5 if I were you. Because AP needs a real stable mount/scope setup.
The rule of thumb - I'm sure you came across it during your research - is: only put half the weight of the advertised max load onto the mount when doing AP. There certainly is some wiggle room upwards. ..
The EQ5 would give you the option to mount a lightweight reflector (in exchange for the refractor - not on top of it, mind.)
With the EQ3 you are stuck with what you are about to load on right now.
Also: if you really get caught into the vortex and develop Aperture fever, you will not find a buyer for the EQ3. But for sure you'll be able to sell on the EQ5.
TS sells a 6" f/4 newt they call "imaging newt" which is very light.
I know you made your choice for their 65mm Apo.
I just wanted to mention the 6" reflector because it is so very lightweight. (It would be good for deep sky. Not so much for solar system.)
Have fun
