The POV at bikeforums is mostly from an LBS standpoint and ignores the equipment made by "suppliers to Walmart".
You are basically looking for bottom feeder stuff that might cost $30 to 40 for a crankset and sq taper BB, $5 for a
single tooth sprocket and $20 for a saddle. In the US Niagra cycles has such stuff (as does Walmart) but in Saudi
you may have to deal with Chinese suppliers, with prices even lower than those listed. If you can find such I would
say go for it. Chain rub on the chain cover is another matter.