The simplest thing would be for the employer to give you a bonus of $1000. say the employer contributed (and I'm not saying it can be done without tax issues for itself) the $1000 to your HSA. not covered by an HDHP plan for 2023 means the contribution would be an excess and would be taxed to you as ordinary income. in addition, you would pay a 6% penalty every year until withdrawn or used.
