Congrats, its my favorite watch.
If you want to add another strap, look no further than the 20mm brady sailcloth. Made for blancpains. Cheap and durable, very comfy leather lining.
Watch straps
www.bradystraps.com
They are just normal spring bars but curved with no shoulder. To dismount strap, put a watch pin remover point, paper clip or very small jewelers flat head in the lug holes to depress the bars, with some outward pressure on the strap at the same time it will release.
Some links below if you ever need new ones, just be sure to stay on the thinner side for the bars because there isn't much room between the case and the bars for the strap. A thicker spring bar will make it very hard to mount any kind of strap.
I have a gen bracelet on mine and I ended up using two knurled pins per side to secure it, you tap them in and they stay put. Tap them out to change straps. This is pretty common on older blancpain watches. I don't plan on removing the gen bracelet ever so it's not a big deal for me. I'd stick with the spring bars if you're going to be changing straps alot.
Masar - Spring Bars - Pumps - Rods - Curve - Curved spring bars. A dynamic French brand focused on quality products -
masar-shop.com
All kinds of Spring Bars! Cas-Ker has the size and style you need for quality watch repair and design. Order in a handy assortment or individually. Spring Bar Tools at great prices, too!
www.jewelerssupplies.com
Read more information about this watch band parts kit. It comes with a variety of spring bars which watchmakers can complete watch band repair.
www.esslinger.com