Do not put in each individual flight... Quarterly make a single line entry of X total hours and the breakdowns for day/night/landings/single/multi/glider/etc..
Can you explain how that would comply with 61.51(b)?
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61.51(b) Logbook entries. For the purposes of meeting the requirements of paragraph (a) of this section, each person must enter the following information
for each flight or lesson logged:
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Ultimately, there are many of these activities, especially among friends and relatives, that will go un-noticed and un-cared-about, with enforcement of violations as unlikely as enforcement of speeding 1-7 mph above the limit.
These are hardly violations involving moral turpitude and, like speeding a little or for that matter any activity involving some risk), you get to make your own personal calculation of the benefit of violating the rule, the likelihood of being caught*, and the consequences if you are.
But, since ignorance of the law is not a defense anyway, might as well understand the rules before you decide it's ok to violate them.
(*although I obviously can't speak for them, I'd guess that, like my clients when I was involved in a criminal defense practice, not one of the folks who has had pilot certificates suspended or revoked for violating 61.113 thought they's ever get caught)