Mark, I shoot a great deal of 5x7 and 8x10. I use a Jobo CPP-2 and Jobo expert drums to develop the film. If consistency is your goal, then Jobo is your answer. The processor (not filled with water) weighs a lot less than a bag of dog food. So if you can carry a bag of dog food, you would be able to move the Jobo from store room to bathroom/darkroom.
Another option would be to get the expert drum for 5x7/8x10 and then use the drum on the roller base. It requires you to manually roll the drum. But, it would take up very little space.
Also, I have heard of photographers here on APUG using the Bessler roller bases with Jobo tubes. I have not done this, but if you do a search, you should come up with relevant threads.
I saw a Jobo CPP-2 sell on fle-bay yesterday for $535 with 3 print tube (including the big 20x24 tube). Last year, I bought one on the LF forum for $600--no tubes included. The prices on CPP-2s seem to have come down from several years ago, but you have to be careful. Try to find one with a late model serial number.
You can still buy new tubes from on-line stores. The prices on fle-bay seem to be high for expert drums, near new prices. Occasionally one will sell for a good price, but you have to be patient.
Another option would be to use BTZS tubes. Check with Fred Newman at the View Camera Store (online). He used to sell these. You could set up you trays over the bath tub or stacked on a counter. Storage size is minimal.