I used to buy the Rombout individual filters - about GBP 2 for 10 - hey presto, fresh ground coffee by the cup (for me - then pax wondered why there was a smell of fresh coffee from the galley!)
Why BA cant load plastic 'cafÉtieres'(as used in m-way service areas) with a pack of ground coffee for F/J , lord knows - you may even find some of the great WT unwashed willing to pay for a decent pot of coffee - come on EZY - be the first !!
KLM/LH/Austrian all use the pillow packs of fresh coffee all through the a-c - some uk charter airlines use instant tea which I am told is not too bad by tea drinkers - as someone has already commented, stick to Brandy for breakfast!!