Am trying to see your logic here... You can buy a Type-9 for 65 mill from LHS 3447, you will go from a shieldless clipper hauling 248T to a shielded Type-9 hauling 500T .
Within a week of owning my Type-9 I could afford an Anaconda, and my ED time is very limited.
fuel is not an issue in a Type-9, just buy a good scoop and haul 468T, still a massive amount of extra profit over the Clipper. Only takes me a minute or so to scoop 34T of fuel in my T9
I did an Excel spreadsheet. My starting data is that I have 26,4m cr (2 days ago or so) in hand, on a 2,937cr/roundtrip route, playing 2 hours of solid trading (more like 3 hour of distracted trading while browsing forum, so I reckon it's equal to 2 hours). Clipper is 240 tonner, my target is the cost of fully fitted next ship (all D except A FSD) with enough money on hand for insurance & a full hold of my most expensive cargo (Palladium was used). That comes to 182,4 M for Anaconda, 111 M for T9.
The trade route is 15 LY apart, I stopwatched several of my Clipper trips and I set onto around 5 trips/hour (it's more like 5.5 trip, but I use the time where I mess up my station approach twice). With T-9 I ASSUME that I will do 3.5 round trips per hour (both slower and T-9 have an extra jump to make due to weaker FSD). T9 will have 500 tons of cargo. I will IGNORE repairs due to dings and fuel expenses, so let's assume no fueling, no repair.
All stats inputted, I will make roughly 7M/day in Clipper, 10.2M/day in T-9. To reach Anaconda money, I will need 23 days (remember that I got 26M already on hand). To reach T9, I will need 13 days (factoring 26M on hand), and then to get to Anaconda using T-9, I will need 18 days. 13+18=31, which is longer than 23 days.
On LHS-3447, I am thinking about it (really), but it's 220LY away and getting there, buying, fitting getting it back to my lucrative route will take 2 hours at least (that's assuming I can find the top FSD on the same dock). Let's assume I got every single module discounted & fitted as they are available at the discounted dock that's a 11M discount. That's 1.5 day/3 hours (lets count it as 2 days) of playtime saved on the Clipper-T9-Anaconda side of grind. That's still 31-2=29 days.
I guess another factor is that I will not sell my T-9. I already own it so it will stay that way (all my unused ships are stripped bare in "drydock"). I will strip it So that's 22.5 Million of modules (discounted modules, assuming I can remove them all, but they can't all be removed so it's a bigger number than reality), that's 2 days of T-9 grinding saved. 29-2=27 days.
Once you got to T-7/Clipper, it's much faster to just aim for Anaconda as your next trading ship than going Python-T9-Anaconda. I was going for Clipper-Python-Anaconda which will actually make it 1 day faster that Clipper-T9-Anaconda (but much more fun), but then they nerf the Python...