my superdooper Lezeyne one fell apart the first time I used it
Yeah they do that. I gave up when the replacement they sent did exactly the same
The trouble is the high pressure. A normal track pump isn’t going to get to 250PSi, even some kind of super roadie one isn’t likely to get there. FWIW it takes a lot of effort to get my tubeless pump to fill its chamber much beyond 100PSi
Because of the small chamber in the fork/shock you generally just want to repeatedly shift small amounts of air to get to the desired pressure.
The only fix that comes to mind is swapping the shock for something with a coil spring