Take that as a sign from the Bike Gods above. Work with what you got. At best you can ride it on those park trails you wanted. I think you mentioned that you replaced the saddle on the bike. If it's still uncomfortable maybe investing in some padded bike shorts would help.

When I switched out the tractor seat on my trike for a gel - type cruiser saddle, for better pedaling efficiency, the first few days were torture. I hurt you know where.

Dang! I felt that the saddle should have at least taken me out to dinner first because of the way it hurt.

However, I didn't want to buy cycling shorts - not yet - so I waited to see if I got use to it. First thing I did was make sure I was sitting on my seat bones. I was. Then I rode it short distances. Each time I rode, I became more comfortable.

Now I'm totally use to it. However, a soft cruiser type saddle may not be appropriate for you if you plan to travel longer than 5-10 miles (as explained by others in your previous thread). I don't travel long distances on my trike (the most 5 miles one way). The folder may be a different story since I'm expecting it to be a lot faster and nimble.

In the end, as wiser posters have said, the important thing is to continue riding. You seem to be doing that already with your Towine. Cool. Now you have another type of bike you can vary your ride with.