I'm a liberal Jewish mom of 3 intact boys. We did not have any kind of alternative ceremony for any of them. I'm sorry to admit that I didn't even have the guts to talk to a Rabbi about it. My Jewish husband isn't interested in Jewish religion and ritual at all, and while I am, I knew that I didn't want to have a traditional Bris for my boys and was pretty sure that even the Reform Rabbi would try and convince us to have one. Family and friends asked about it and we just said that we didn't have one. We got some funny looks (the same looks we got for co-sleeping, extended breastfeeding, no CIO, etc.) but nobody gave us a hard time. You need to know that nobody in our family or amongst our friends is particularly observant either, so that probably made a big difference for us.
Since some of the traditional Mamas here have expressed that they are offended by alternative ceremonies for boys, and since you are going to be seeing your friends and family during the high holidays (probably not the best time to be radical), you might want to consider having a private naming ceremony at home before you travel, and a non-religious party to welcome the baby when you travel home. I know it is not what you want, but would probably ruffle the least feathers, and be easiest for you to handle when you are postpartum and hormonal still.
We did not even give our boys Jewish names, and now that I am wanting to embrace Judaism more, I regret it. So I definitely encourage you to do at least that.
Sorry I couldn't be of more help. Hugs to you, and may you have a wonderful birth!
Judy mom to Dash (9), Corbin (7) and Will (3) :