Personally, I'd recommend a fish option - little hassle and takes no time when you are dealing with the rest of the meal..
If the ovens is on for the rest of the meal anyway what about a roast fish dish, like monkfish fillets, tied round orange slices with herbs and cooked on a bed of sliced fennel....only needs 2 fillets tied round a cut up sliced orange, and some fennel ina roast pan, so not really ading to the prep. Serve with the same veg and its a nice tasty option.
Again as the oven is on, pan roast a selection of veg, drizzled in balsamic vinegar and loads of herbs. Good side dish anyway, and for the vegetarian, cook a nice hake, conger or turbot steak, serve on the veg and enjoy - the fish will cook +/- 3 mins one side then turn off the heat, turn the fish and deal with the rest of the plating u. In 3 mins the other side of the fish is done and ready to serve with no extra attention...
Or, put a nice salmon steak in a parcel of tin foil, add a little butter, some prawns and fine sliced leeks. Seal, place in hot oven and takes 12 - 15 mins to cook and can be served with the rest of the veg with everyone else.
Tofu or TVP (textured veg protein) 'logs' need a lot of sauces or seasoning so I would say no to this. And as far as yuk to how quorn etc is made - think of the antibiotics residue in the turkey meat.....