I would have thought tray processing C41 unless you have dish warmers was a recipe for disaster I can perhaps see why people use it for B&W when they are doing developing by observation.
If you have been tray processing this presumably means you have either a dark room or a room you can make dark so why not try dip dunk sink line processing ?
All you need are some film hangers
http://www.secondhanddarkroom.co.uk/product.php/kodak_5x4_film_hanger/?k=:::6034600 you can find them on ebay to usually in the states and in multiple configurations (MrCad usually has hangers too) then people use whatever Tupperware alike containers suit in a water bath aka washing up bowl of suitably warmed water.
There are posher ways of doing this the best I have found is the Fotosell print processors these are stainless steel temperature regulated water baths with four acrylic tanks with floating lids the GL80 takes four litres of chemistry in each tank and I believe the minimiser uses two litres. People also use the nova processors and the Jobo DuoLab but using plastic containers in a washing up bowl is a good way to experiment.
Or you can always try what was
the best designed small 5x4 tank
Failing that Jobo 2509n real and suitable tank