If you are serious about a low money league, then you should probably create a low money 2on2 league. There is still no ladder for 2on2 and there is only BWCL, where you can play competetive 2on2 (1x 2on2 BO3 in each clanwar), which doesnt really satisfy the needs of the 2on2 players. As a 2on2 player originally myself (before playing fastest with the announcement of Remastered), I was playing 2on2 low money mainly and I can tell you that there are a lot of players just waiting for something like SCW for 2on2 low, myself included. So I would suggest creating a league like SCW (with ladder rating and replay upload and stuff) for 2on2 low money. If you advertise it properly, there will be probably the same or even a bit more players like in SCW.
Anyway any initiative and work from the community should be praised, so thank you in advance, if you really create a league (even if it is "just" a competitor to SCW).