Something else that would be useful for you to buy – and which will be very low-priced compared to the minis you’ve bought – is a set of full-sized plastic poker chips in different colours. In the A&A board games, multiple units of the same type are indicated by putting mini-sized poker chips under the sculpts; this is a trick that saves on space and that makes up for the fact that players have a limited supply of sculpts. The same trick will serve the same purposes in your scaled-up version of Global 1940…but because you’ll be working with large models, you’ll need large poker chips.
Incidentally, if the A&A Minis turn out to be too large for a practical tabletop map, and you’re still determined to use the minis, then you may need to take your basic concept to the next level: make your map even larger, print it out in sections, and lay it out on the floor of a suitably large room. If possible, cover the map with large sheets of transparent acrylic to protect it from scratches, then put the minis on top of the acrylic. This would be similar in concept to Fletcher Pratt’s Naval Wargame, which was briefly popular in the 1930s: it was played with scale model ships (carved out of balsa wood) on the floor of rented ballrooms. Players were required to play in their socks, to reduce the risk of crushing the ships.