Of course it helps to check your syntax...
$client->SetTint() seems to process, but it'll take some messing around with since the color is a 32 bit integer. It might be Color_Struct, which is int8 blue, int8 green, int8 red, & uint8 use_tint (see item_tint under
profile).
I haven't seen any results, but it looks like this is what will need to be used.