You can go the hanging pedal route. There are plenty of companies making kits. You can go with a remote reservoir kit. You can also, with some difficulty, service the master from underneath with a turkey baster style tool that has a hole attached. You will have to use a mirror or your fingers to feel how high the level is. Probably why I went with a see through reservoir bowl on my Model A.
On my first truck, I found a weld in/bolt in flappy door that stayed under my rug. You can get them with lock cylinders if you're feeling fancy. McMaster Carr has those things listed in their catalog. I believe under "access door." Get it as big or as small as you want.
