Nice score on that vintage suitcase! I've attached a link to a very cool website for travel stickers for your luggage. Like most on here, I attached the stickers then applied a coat of decoupage/varnish over them to waterproof to some extent. Have fun decorating your case.
https://laughingelephant.com/stickers/travel/
A lot of folks on here got their luggage straps from a fellow SOCer, Dusty Johnson, a leather artisan. Unfortunately he recently passed away so I don't know who to recommend for you.
As for toting luggage on your rack causing 'blind spots' on passenger side, here is a simple & inexpensive solution. A suction cup convex mirror attached to the passenger side of your windshield. Can be found at any of your local auto parts store in the towing supply section.