Have a read of the CPE handbook again. Particularly, look at 3-year cycle CPE "requirements" versus per year "suggested" totals. Also, look at the criteria for CPEs to rollover between 3-year cycles. Based on the understanding of those things, I suspect what you want to do is not actually required.
To answer the question though, as you have stated yourself, it's suggested you submit all CPEs for a single CPE activity (whether that activity spans hours/days/weeks/months/years) as a single submission with the end date being the key as to which 3-year cycle the CPEs are applied against.
However, if you can legitimately justify, if faced with an audit, why the CPEs were submitted in more than one submission, then that could possibly be fine too.