Integrate the Checkout URL in the Asset Page for Unlock Memberships. The asset page should be easy to Buy or Renew a Membership depending the case. If possible, substract the Unlock Protocol redirect Link so users dont leave the website.

Idea only :

Also a Integration more prepared for "Events" that could be added to add Utility for Real World Events". Marktplaces could then Token Gate this integration with some Membership or NFT, for Event Managers