Consider these issues with plan "B". Misplacement of your jack stands could lead to eccentric loading of the ramp causing it to roll laterally one direction or another. It was designed to distribute it's load across it's entire width at both ends of the ramp thus making it stable. Loading the ramp on a single smaller point (jack stand) may also overload the ramp locally causing buckling or bending. I am not saying the idea could not be made safe, but I am saying be very careful about your design and using equipment for applications other than the original design. I am not proposing a design because I am not a registered engineer, but you may consider supporting your ramps with a combination of jack stands and a sufficiently large beam (wood or steel) that would span the two jack stands and the ramps. The ramps would bear upon the beam that was attached to the jack stands. It would be good to attach the ramps to the beam (bolts or pins) and to attach the jack stand to the beam (bucket, brackets or pockets). Make sure you have chocked the trailer wheels both directions and have jack stands under the rear of the trailer.
After writing all of this it may be less hassle to find a new shop space that would allow your hobby and a 2 or 4 post lift.
Cobra Chuck