On a compact cockpit, moving one thing changes the space around everything else. A keyboard tray can solve a reach problem and make it harder to clear the shifter when you stand up. A good trial makes both effects obvious before you've committed the entire layout to the change.
Choose one problem and measure its space
Write down what's bothering you in terms you can test. Maybe the mouse is too far away to use from the seat or the pedal cable has to come out every time you put the rig away. Measure the room the upgrade gets in both positions. Include the frame, the part, the connector at the end of any cable and the path you use to sit down. On a folding or movable cockpit, follow the manufacturer's instructions for stowing or moving it.
Keep the old setup easy to restore
Take a photo of the original layout and bag any hardware you remove. Use a manufacturer-approved mounting point or an adjustable bracket suited to the frame if you want to try another position later. Check the dimensions of any rig accessory against your measurements, then install it and leave the other controls where they were.
Use the new position for a full session and put the cockpit away afterward. Check whether it fixed the original problem, whether setup takes longer and whether the rig still fits in its stowed position. Move or remove the new piece if you find yourself working around it. If it passes all three checks, record the position so you can reproduce it after the next change.