Men's accordion straps would be way to wide and would make your good looking box look abnormaly large.
Woman PA accordion straps, with much less width, should look more appropriate, even kids, should do the trick.
Do not buy used straps as the leather retains all the perfumes used by the bearers, and that wouldn't be to good for your particular allergy .
If you decide to go for accordion straps and want to join them in the back with a "joiner', that is assuming you don't have one, get an old leather belt with a more or less matching colour, then visit your nearest shoe repair man with your accordion on witch the 2 straps are attached , wear it and your new "buddy" will adjust and cut the joiner to length and rivet it at both ends.
The joiner should be riveted as it allows the two main straps some movements.
I just talked to Danny on the phone Friday night, and he was alive and well at that time. He is sending me a case for the Le Capitaine. He also hand-made me a set of double leather straps for my accordion. Helps a bunch when standing up. Lots of room to adjust for arm-length, belly-size, etc. Can also seperate them and use just a single strap over one shoulder, as well. Give him a shout. His site can be found by browsing Le Capitaine accordions, or e-mail me direct and I will give you his cell. Right now he is working on my Arrieta, beefing it up.
JB
Keeping it in the car is not a bad idea, for impromptu practice. Just went and got me another First Act toy accordion tonight, probably for the car, if I don't raffle it.
Hey, Dwight, my next door neighbor's little 5 year old girl just had to have an accordion just like Mr. JB's, so they bought her one of those little plastic jobs. Sounded dang near as good as old Ling Ting Tong's genuine not-hand-made grenade.
JB
The First Act accordion is not bad. The others are either crap or junk. But I still have to go in and pull them out the box to see if they're adequately tuned, etc.
This is as much as I was able to decipher from your post!