Readed about the telnet hack fixed in one post
You clearly didn't read that thread closely. But you seem to be set on the Rigol, so that's probably what you should do.
You are right, I am sorry..
The Siglent 2042X is a very good unit, It has pro feature, but the 75 Msa/s of the Arb is a pain in the a** but the other feature make it a bargain in this price range, but I don't have the money to afford it, and also my oscilloscope is only 100Mhz bandwidth (130 technically) so can't see all the armonics in a lots of waveforms
Then you might like to look at the SDG1032X as it's ~140 EUR cheaper and apply similar tricks to improve it like what's done with 2042X.
Then start a thread about doing it like the 2042X has. 
So the sine of the 1032X is upgradable to 120Mhz??
Rumor has it to 60 MHz, the same as 1062X.
1000X models do sine and square to the same frequency.
2000X models only do square to 25 MHz.
It's all in the datasheets.