Don't think transfer walsh make any problem here, generally you don't open a light 1♣, and here you are still able to play in 1M anyway. But I'm thinking of stop playing Kaplan inversion in 3rd/4th, since 1♥ can be a light opener.
[hv=pc=n&s=s7hkqj3d972ckq632&d=n&v=0&b=1&a=1sp1n(semi-forcing)p2c(nat%20or%2016+)p2d(8+)p2s(5+%21S-4+%21C%2011-15HCP)p]133|200[/hv] obviously 3♣ is a signoff, and 2NT also seems poor.