SirNose,
Of course, the impetus for your decision (and its necessary risk) is known only to you - somewhere deep inside. I expect you will already have taken a bit of time to do some self -analysis (i.e., soul-searching) before arriving at your decision and will have found the act and its potential ramifications acceptable to you.
I applaud your courage; after the fact of most situations, that which one most regrets is the challenge (whether implicit or explicit) not accepted and the opportunity not seized... to give body to one's deepest intuitions! The alternative may provide shelter and safety - albeit tainted, tempered and temporary - but it is the bold victories and achievements that give the greatest pleasure and sense of worth.
As a suggestion to fleshing out your 'apology' for the appropriateness of your to-be-espoused views: Perhaps you might reflect aloud (before the congregation) that the Watchtower Society in its many legal incarnations/incorporations is publicly and officially registered and acting as a charitable organization.(!) A sense of Christian duty as well as honour before men of all sorts, therefore, behooves both the Society and its associates (i.e., colloquially, the individual JW) to fulfill that self-engaged duty to provide charity of a broad range (including both spiritual and physical succour) to persons in need of such.
I wish you sustained courage and steadfastness in your presentation.
-V