Is it possible to provision multiple Internet services over a single UFB connection?

I recall reading somewhere that this was possible (for TV services etc.), but I don't recall where I saw that comment.

Assuming it can be done, is it simply a matter of asking the ISP to provision service on the second port of the ONT?

This is only a short term solution, while I await more plan options from various ISPs. Unfortunately no ISP offers everything I need at present, and I need to increase my data cap. With the Bigpipe deal, it'd be cheaper to set up a second connection for two months than it would be for me to add more data to my current plan.