Engagement party part of small church reception but intimate wedding

So my partner and I have gotten into the pre-engagement wedding planning phase of the relationship 🥰👰🏻😍.
We both attend the same tiny (50 ppl) church and have a lot of friends there. One of my bridesmaids typically hosts the after church reception and we’re thinking of asking her of using this time a week after the ring goes on to help us kickoff celebrations. I just want what normally is done plus champagne/ Prosecco and cake, maybe a table-cloth on the table, string lights hung up (possibly I know my future brother in law would love to help with that), possibly an instant camera, and starting our guest book (a Bible to highlight verses, that would also serve as our journal during this exciting time). However, we both get social anxiety and are planning an intimate wedding of 61 TOPS (the venue we’ve fallen in love with only allows that many), so we would only be inviting the churches inner circle (10) to the actual event that would take place 14 months after. I know it’s a rule not to invite people to the engagement party that aren’t a part of the actual wedding but if we don’t ask for gifts can we celebrate in this fashion and include it in the church bulletin.