I know a few people that have used clear vinyl tubing that fits the groove with good initial success.
But .....I think bronze ports get pretty hot in the sun so I wouldnt expect the tubing to have a long life. Never been around them long enough to hear long term successs.
But in a pinch or if willing to replace it every other year or so, might be worth a shot. I might try it next go around as even the gaskets I got last time were pretty dang expensive and tend ti stick if not opened every couple weeks.