Just a few notes, though… Go into your appointment forewarned, Apidra is another option similar to FIASP, but it is not Lyumjev. I don’t know where you are, so Lyumjev might not be approved yet there, and/or your insurance company might make you jump through a few hoops to get it. If you can’t get Lyumjev yet, and your Endo suggests Apidra, it also had mixed results in the T:slim. Seems to be 50/50, with half the users reporting occlusions and the other half having no problem. I wouldn’t buy more than 1 bottle of Apidra until you see how it works out for you.
I can’t remember who, but another member here reported solving the occlusion problem by mixing either their Apidra or FIASP with Humalog or Novolog, half and half. They still saw faster acting insulin than Novolog/Humalog alone, and no longer had the occlusion problem. If you have any Humalog or Novolog left, maybe give mixing them a try in your pump?
Last note: if you’re using Control-IQ on your t:slim, you can’t change the duration of insulin action to better align with Lyumjev. (The difference is much more marginal with FIASP and Apidra, so doesn’t matter much here). The Control-IQ program was written for Humalog or Novolog. I suspect they’re going to unlock this setting in the next software upgrade, but until then… You will probably notice the pump reports a little more insulin on board than is realistic, since Lyumjev has a shorter tail. It’s not a significant problem, but the pump might suspend your basal unnecessarily. That can be addressed by raising your correction factor SLIGHTLY, though.