I can see that you are a Nigerian too so I have these few questions for you, is paying the bride price with Bitcoin acceptable? Do you think your lnlaws will buy the idea of paying with Bitcoin? In Nigeria I know that paying a bride's price is not just about the bride's family alone, there are people that are involved in the whole thing and it isn't appropriate to do this. There are many ways to achieve this your aim of being remembered, if you want to give your in-laws a part of your asset then I suggest you do it after the whole marriage is done then you can use Bitcoin to appreciate your in-laws for raising a great daughter.
Acceptance or not is not the challenge or problem here because as it stands now in Nigeria, I believe most families would have young people who understand bitcoin and how to go about it, at least marriage is about extended families. Even if it is in the village, there are family members that would come from city to attend. I guess Op just want to save the wallet address where he sent the btc out from and probably start showcasing it on anniversaries.
But Op should understand and know that when he says pride price, that will include marriage rites and all the food, drinks on the list for the woman including merriment. So all those preparation will be done as soon as he transfers his bitcoin a week or two before the D-DAY to enable preparation. That bitcoin will not be in your in-laws's or third party wallet for the purpose of hodling for it to appreciate and value risen. So it is going to be used immediately after conversion.
Therefore, it might not be of any meaning to them but stress to convert it. You are just going to benefit in your bid to create your own history as someone who paid out bitcoin for the celebration of your marriage.