I think this would be an adorable bag for you hon.
I don't have a speedy, and I am not sure if you can attach a strap, but even if you can, it may be uncomfortable and bulky due to it's shape and size. It is made to be handheld.
Can you go see the bags in person and see if you might like a handheld bc it would be so cute for you!
Good luck!
if this is your first LV purchase, i think you should go to the store to try it on. that way, you would get to try on the straps too. do you live close to any LV stores?
If you want something with a shoulder strap, maybe the speedy isn't the best choice? I have a speedy 25 and think the shape of it would be really awkward with a shoulder strap...it seems like it would always be bumping into you, particularly since it isn't a structured bag. Just my thoughts.
I think it is hard enough to carry it on my forearm without it getting too awkward! I did not want my vachetta handles to get dirty on the first day out so I hardly used them but yikes it was harder to carry on my forearm because of the shape!