Actually, and not sure you'd want to consider this, but its what I did.
If you buy a booster, like the SB5 for your powercab, the powercab becomes a procab. Then, you can install as many panels as you like, moving around as you wish. I have a small layout(L shaped, 8x4 with a 3x2 yard added). But, i found like yourself, that the cord was limiting my movement and function.
So i added the booster and another panel at the end when im doing jmri. I purchased a CAB06 and that does 2 things, it lets you set up dedicated programming tracks( mine is in my yard, and it has bumpers just like any other yard track), and then, you can disconnect while your trains are running if you wish, and they continue until you plug into another panel and resume controlling, switching, e.t.c. It actually gives you 2 separate systems.
You don't have to purchase the second(or in my case 2nd and 3rd) CAB immediately, and can just use the powercab the exact same way as you'd use the little cab. It also allows multi user control(sometimes, I'll run on the main, while my wife messes around with a switcher in the yard, setting up car configurations for me on that end of the layout). All just by purchasing the SB5 booster.
I have a wireless cab, but ihave to send it in, and then, like you said, ihave to buy the receiver, and ijust haven't felt like doing that as of yet. So there are plenty of options. Not to mention, with the booster, you gain much more amperage..
Hope this helps somewhat as another option..
Sent from my Note 10+ using Tapatalk