Main problem with those, for your case, is not the freehub itself, but the fact that the axle width is probably 130 or 135mm, vs 120mm for your Motobecane rear dropout spacing. There are many nuances to exchanging rear hubs & axles, unless you do like-for-like.
An easier and possible cheaper replacement path for you would be a set of vintage 27" (less expensive) or 700C (more expensive) alloy wheels, either from the for sale sub-forum here, or ebay. You would be best off with an axle width of 120mm, or max. 126mm.
You may also be able to find narrower (120mm or 126mm rear) new wheelsets, that take threaded on derailleurs instead of cassettes.
There is also the option of spreading your rear triangle to accept a wider, modern axle/hub like the ones you linked, but that is not a decision to be taken lightly, and is a procedure best performed by a professional or experienced amateur. Then you will also have to determine how many rear cogs you want/will fit on your cassette, and what shifting system to use with them.