Looks like you know about the removespare command... your question is not "how", but more of "should I". The official HPe recommendation is raid6 with standard sparing.
Some businesses can tolerate downtime and handle restores after hours or weekends, while others lose money every minute the system is down and risk averse. What are you and the business comfortable with? It's your decision, and risk to own. Kick the question up the ladder along with your professional recommendation. Present the options, explain the risk, and outline the process to recover if the risk becomes an outage event. They can accept the risk, or upgrade capacity, or perhaps volunteer to delete some of those QA/TEST systems they asked for but never use
Some things I recommend you factor into your decision:
Check for any zero reclaim/compactcpg opportunity to get space back. You may need to manually run some commands on the host to zero out whitespace on older operating systems. I generally prioritize largest volumes with the highest used% first.
If you have any Fully Provisioned volumes, you may be able to reclaim space by converting them to thin.
Make sure you are not missing any patches/firmware that address SSD failure rates.
Your drive failure history. Is it one drive a week, or one drive a year?
If you have an ASM/Proactive Care Advanced, discuss this with them, verify part availability and gauge expectations for drive replacements. The longer the ETA for part, the longer you would be at risk of double disk failure.