Exercise bike saddle adapter

I have an exercise bike that I use for HIIT sessions when I’m not man enough to ride in the rain. It has a horrible saddle on it, the issue I have is the saddle mounts using a 4 bolt plate, does anyone know where I can get an adapter to fit a normal bike saddle to an exercise bike like this?

Current saddle mount looks like this –

http://www.exercisebikeseats.com/images/schwinnairdyne1.jpg

I’ve found this for sale on eBay –

https://www.ebay.co.uk/itm/Exercise-Bike-Bicycle-Seat-Adapter-Kit-Durable-Steel-Construction/361918219763?hash=item544401c5f3:g:rHsAAOSw32lYuKws

But didn’t really want to spend £50 on an adapter…

what model is the exercise bike? do you have any pictures?

It’s a nordictrack vx400, the current mounting is like this

http://www.exercisebikeseats.com/images/schwinnairdyne1.jpg

Bump

How is the seatpost attached? Could you replace it with a regular seatpost?

Or cut the top off your seatpost, then attach a ‘guts’ seat clamp.
Something like this for £2. https://www.jejamescycles.com/raleigh-saddle-clip-why6476.html