Go ghetto.
Sounds like you already have another bike. If you do then this one can be just for playing around.
Try setting it up as a cheap single speed before making the jump, thus the ghetto.
Anyways, this is what I am doing to my Chameleon. Can’t see your pic here but if you don’t have a horizontal drop out you might need a tensioner. Regardless, you could lock the derailleur on one cog and remove the cabling and front derailleur. That way you’ll see the weight difference and be forced to ride without being able to shift.
Ride it like that for a few weeks and if you like it then make the jump.
Read somewhere 1-1/4" PVC tubing works as spacers for the cog. It works as I had some leftover PVC pipe. Really tight fit but it works. Was thinking of doing that but I only have leftover Shimano cogs which are thin. Don't want to install the thin cog on my King aluminum freehub. Also didn't want to spend $30+ on a wider base cog not being sure of what gearing I want.
On my Chameleon, right now I have the main body of a XT cogset which starts with a 17 tooth cog. Added leftover cassette spacers from my parts box and locked everything down. Did this all last night so I didn’t have a chance to ride it yet. Chain line isn’t perfect but it will get the job done. Can’t wait to ride it.
Like everyone is saying, $200 isn’t that much but if I had to ponder spending that amount, perhaps you might try doing it on the cheap first just to make sure you want it.