I'm quite a big boy on 1.80cm and 105kg and maybe this issue is singular to me but I cannot stand the MP3's seat more than 20 minutes. I commute it daily now after almost a year of not riding it due to the pandemic and I was quickly reminded about the shitty seat. The driver's seat is to small and too upfront and also there's no support to stop you sliding forward.
I looked for replacement seats but on Shad's website they only offer seats for Piaggio till 2015 mine's 2020. I looked here in France on the Top Sellerie's website in the hope I can reapholster it. The quote was about 500 euros

The airhawk thingie here it's about 200 euros (def not gonna pay that much for an inflatable for what it's essentially an inflatable pillow).
Also no after market seats for 2020 HPE 500 model.
Any suggestions?