symbol spread setting

[watchdaride]

Since you cant get the $dxc dollar index anymore is it posible to make one with the symbol spread feature

I wanted to do jpy , gbp eur only . I tried to input as the following eur a0-fx + jpy a0-fx + gbp a0-fx

the 2 problems i see are eur & gbp uses decimals to 4 places
while jpy uses 2 places
Also gbpand euro goes a different direction to the yen .

Any suggestions as how to do this?