The Royal Enfield Scram 411 would be a good bike to learn on.
The Husqvarna Svartpilen 401 is also a pretty cool bike and more modern than the RE.
From what I’ve read, the Royal Enfields require more frequent maintenance, but that’s probably not a deal killer unless you’re a long-distance type rider.
The Royal Enfield Scram would be a good choice for the OP. I have a Bullet 500 I bought in 2019. I tell people that in 1933 when the 500 was first sold, it was the fastest motorcycle in production, but now it is certainly the slowest. I have not had any unusual maintenance issues: I’ve replaced the battery once and the aftermarket canvas paniers twice because they faded in the sun.