It sounds like you would be well suited to what Tac0 suggested
They are very similar, with a couple of differences
Both are P71 Java Cards.
The Apex Flex is managed via the Fidesmo ecosystem for user-friendly app deployment. The flexSecure is a “naked” version using GlobalPlatform, for manual applet management.
Apex offers easier setup, while flexSecure provides full administrative control and a little more storage.
I have one of each
heres a little write up that may help you decide
Just note,
After sone amazing work by @GrimEcho and @StarGate01 there has been some awesome work by Tacos making the FlexSecure far less intimadating to get up and running, plus it comes with some “essential” apps preloaded (which you can remove if you want)