Nope - I'm taking it up with you as you bought one and I'm sure you could have easily bought one without a saltire.
If you ram a saltire (or a union jack) onto the poppy I cannot see you aren't sending a message that somehow Scottish (or British) dead are more important for remembrance than other dead. The poppy and remembrance should transcend petty nationalism - not least because many of those dead, particularly in WW1 (and arguably in WW2 due to the legacy of WW1) died precisely because of petty nationalism.
You don't need to lecture me on flags.
My grandfather fought at the Somme.
On his return, he threw his four medals in the midden, swore that if he ever came near a union flag again, he would use it as a substite for toilet rolls, and refeused to buy a poppy at any time, though he donated to the Earl Haig fund.
His brother, who also fought for dear old blighty, was slaughtered by the black and tans whilst visiting his cousin in Ireland.
Presumably, if the Earl Haig fund felt perfectly happy making a different poppy from that of England, and, later, a poppy with a Saltire, they had no issues with this, in a time when there was less demand for Scottish autonomy.
That they still manufacture the Saltire and Poppy shows that there is a market for the product.
If it raises money for British Legion (Scotland) then that's fine by me.