First thing, be careful with hot loads. Learned wisdom has taught us to start mild, and work your way up. Checking for signs of over pressure etc as you increase the powder charger. Also, continuously shooting hot loads through a gun could cause problems down the road.
Second thing, I too have also looked into the substitution of primers. I have heard YES, it works well enough. I have also heard NO, don't push the idea. Primers are designed for use in 'X' type of cartridge and leave it be. Personally, I go with what my books tell me.
Lastly, you can easily make a movable reloading set up. Use a solid board to mount your press, powder measure or other equipment to which then you would clamp down to a table or other work bench. Good luck with everything.
They primers I am mainly curious because of how getting primers can be right now, aka if I am desperate to reload some rounds for whatever I might need them for
As for the moveable press, I know I could set it up as portable, but I really want to have a more permanent set up. I wouldn't have my powders or prints there though.
I have just found out that there is a 4 leg stand of heavy steel that looks to be perfect for a press (about 1 ft square on the top) and a metal desk in the metal recycling bin at my work. Im bringing my boss a bucket of fat wood then asking if I can grab them lol. The stand is a little I think so I am gonna sink it into the ground a little bit which will also make it a bit more stable I'm hoping