Don’t think that other thread addressed how to do this.
Honestly, the easiest solution would be to just hard code the links to checkout. You can copy the HTML generated by the default membership levels page if you like it… and just cut out the levels you want.
You can use the [checkout_button level=”3″] shortcode to generate a button/link to the checkout page for level 3.
What this won’t have is the functionality to show “Your Level” if the user has that level or to automatically add new levels when they are added. You’ll have to manually update them, but it is straightforward to do and easy to customize.
Alternatively, you can copy the code in the levels page here (https://github.com/strangerstudios/paid-memberships-pro/blob/dev/pages/levels.php) into a custom template or something.
Hope this helps.
Also, FWIW we have ideas around a shortcode just like you describe in the OP for future versions but not sure when we’ll get to it. It would be really useful to be able to do something like that in just one shortcode.
I did it with a Hidden Levels for Paid Memberships Pro. Create the php in plugins and activate in dashboard. Works like a charm!
https://gist.github.com/strangerstudios/3100680
