I’m learning on an ’80s GSX750, sure it weighs a lot more than an modern lightweight starters bike, but why should it kill me?
This whole obsession about cubics isn’t the only solution or a guaranty that you won’t crash. Where I come from (Sweden) people generally start on a lot bigger bikes than 250, truth be told, there are hardly any small cubic bikes to be found in sweden.
Imho, it’s all about your intentions with the bike, a guy in his twenties wanting a sportsbike probably shouldn’t start on an 1000cc rocket with a high power to weight ratio.
I think you are gonna have to look inside yourself and ask wether you’re the type of person that can refrain from pushing the limits of your bike the first season/seasons, or not.
From what I found, the weight of that Magna is just over 500 pounds, some would probably say that’s a bit much, but I think that having a heavy bike can really have a positive impact on ones respect for the bike. Ones again I can only refer to my own limited experience, but both my own bike and the bike I drive during the mc classes weigh about the same and a bit more than that Magna, and it hasn’t been a problem yet, but it surely helps me appreciate the risks involved.
Good luck to you.