Well, Scott,

Rode's PinMic is undoubtedly a beautiful-sounding (albeit rather expensive) lavalier, and as you're only fitting it to one person, (unlike our need to constantly re-attach for costume changes) the "pin-stick into finger" problems that we suffered may well not occur, ...especially not now that you're forewarned.

There are, however, two other critical issues that apply to your intended use:

1. Gain. As I mentioned earlier, I'm unaware of anyone having reported the levels that a PinMic actually feeds into a V70/V75 beltpack and
2. Feedback. Like the majority of lavaliers, the PinMic is omnidirectional, meaning it picks up sounds from all around.

That second point may well give you a lot of grief, as the chest location of such a lavalier requires much more gain than the "next to the corner of the mouth" position that allows the successful use of (seemingly similar) omnidirectional headset mics with PA systems such as yours.

Like all radiation, (such as light) sound follows the "inverse square law", whereby halving the distance doesn't merely double the gain, it yields four times as much, (the square of two) with a third the distance yielding nine times as much !

So my suggestion would be that you hold off on investing in a PinMic until after your wife has experienced for herself the amazing comfort and unobtrusive excellence of the mic that I'd recommend for your pastor, ...one of these:

http://www.amazon.com/Samson-SE50-Headset-Microphone-Beige/dp/B002BO53LO/ref=sr_1_1?ie=UTF8&qid=1359669301&sr=8-1&keywords=Samson+SE50

(Also available from other reputable audio suppliers such as http://www.sweetwater.com/store/detail/SE50tan/  or http://www.bhphotovideo.com/c/product/586049-REG/Samson_SASE50T_SE50_Headworn_Condenser_Microphone.html )

I own a dozen of them for my eight XD-V beltpacks, four configured with large windshields for exclusive use by rugby referees, with the remaining eight being used for exactly your type of vocal (PA) work. (Feel free to click on my pink avatar at left for details of my location rig.)

(A little "tip": a tiny dab of clear silicone "goo", the type used for sealing leaks in tiling and shower recesses, carefully applied from a pin's head to the side of the SE50's mic body is a great way to avoid the mid-sermon loss of its foam "pop-stopper" windshield, even though Samson, uniquely, include several spares ...and their replacement parts are cheap.

That "goo" is then easily "rubbed off" and re-applied when replacement is eventually needed.)

I'm confident that, once tried, the Samson SE50 will become an indispensible part of your spreading The Word via Line 6's brilliant beltpacks.