do you mean xplornet satelite broadband?
Also, bittorrent downloads require you to make a connection to at least one tracker (optionally to dht networks too), and to multiple peers to get your files. If you restricted to only one peer connection, the odds are very poor that you would find a good peer that is able to give you the 125kB/s you desire. Plus, no peer is going to send you data if you don’t send them data, and how are you going to get any data that they want if they are your only source.
Basically, even if you found a peer to send you 125kB/s (your max download speed), as soon as that peer realized that you didn’t have anything of interest to send back, it will ignore you.
Or, if you want the “short answer”, then No, it’s not possible.
There is a solution to your situation though, Rent a seedbox. A seedbox is a remote computer that runs torrents on your behalf. You then connect to this computer via FTP and download the completed tasks to your local PC.
By strict definition, a seedbox is a dedicated computer that you control, but many people sell accounts on these servers claiming they are a “seedbox”, when it really is just a shared user account on someone elses seedbox. However since your connection speed is so slow (125kB/s), even a shared seedbox would easily give you more bandwidth then you can handle.
These days even a slow dedicated seedbox can upload at least 10,000kB/s (some much faster).
ps. If you want to reduce the amount of overhead and connections made, then I suggest you disable DHT, peer exhange, peer discovery and all the “services” listed in options. This may help for low bandwidth users, but keep in mind that some torrents rely on dht instead of a tracker, and won’t download if dht is disabled.