I am right handed, but lost central vision in my right eye in my teens. I have peripheral vision on the right side.
I have always shot long guns from the left shoulder .
Shouldering on the right side is downright weird to me (not to mention that I can't see squat).
I use right handed SxS guns and put cast on the stock.
Regular lever opening is just fine.
The trigger order does not matter.
Cheek pieces are really hard to find on the right side of the stock, except with a restock which I get done in some cases.
Some triggers are bent for the right hand, some are pretty ambidextrous.
I don't own a gun that was Lefty to begin with except my Bolt action rifle.
Jones underlevers are tough to use as well and can't really be adapted at a low cost.
Greener safety is not good either.
Grant Sidelevers are OK.
Overall, it's not a real problem. The shooting is the real problem... :-)
Best regards,
WC-