If you own a snowblower, you absolutely live in a location that needs heated grips on your motorcycle.
I live in CA and even use them on the few “cold” mornings we have. Go buy them from the link below and thank me later.
Bikemaster Heated Grips for 7/8in handlebars - One Size https://www.amazon.com/dp/B009Z1KQ2M/ref=cm_sw_r_cp_api_wGGyAbMSPP51J
I have heated grips and heated gloves. Heated gloves mainly for the top part of my hand and grips for the bottom.
This is what I have on my KLR and even on the lowest setting get very hot. https://www.amazon.com/BikeMaster-Heated-Grips-7-8/dp/B009Z1KQ2M/ref=sr\_1\_6?crid=17HP7UKJ41ZIC&keywords=heated+motorcycle+grip&qid=1669789769&sprefix=heated+motorcycle+grip%2Caps%2C129&sr=8-6
Decent setup that will probably do you good for this trip. It sounds like you've given yourself a relaxed time table too, so if you do start to get cold you can always take a break, grab some food, and warm yourself up before going back out too.
On a longer trip I'd seriously start looking at some of the stuff like heated socks or gloves (fingers and toes are the first to go with high wind exposure and lower circulation). They can turn into a couple hundred dollar setup, but they'll absolutely elevate your enjoyment of tour riding, again hard to express how unfun riding gets once you start to get miserable cold.
Another option I've run for several years is heated grips. They work okay, and it's nice they're always attached to the bike for use, but I do think heated gloves do a slightly better job at warming your whole hand.
I’ve been running these bike masters for a while, and they get pretty toasty, pretty quickly. $41.
BikeMaster Heated Grips (7/8) https://www.amazon.com/dp/B009Z1KQ2M/ref=cm_sw_r_cp_api_fabt1_DKrWFbP8VV8K0?_encoding=UTF8&psc=1
Bark busters/hand guards help, too.
One thing that isn't explicitly mentioned here is the difference between reflected and projected headlights. Halogen lights are reflected and LED's are projected. I'll let you do your own research on this matter because there are a bunch of articles that will communicate the difference between them better than I can. While you can put a LED H4 bulb in a relective housing, you definitely should NOT do this. The beam pattern will be all wrong and blind everyone. This is not ok. You should only use a projected bulb with a projection housing, so if you want to go LED you should pony up for a full on kit. This is all under the assumption that your bike now has a reflective housing.
Also, your stator might be able to keep up with the power output with the heated grips attached. I recently purchased the bikemaster heated grips and threw them on my bench power supply. At full output they only used 30W of power and these bad larrys put out plenty of heat. I've only ever needed them at half power riding in ~40F temps. Good luck.
I just put a set of BikeMaster Grips on my bike and tried them out a couple weeks ago in 45°F rain at 9000 feet. They do the job well, even through my thick cold-weather touring gloves. We'll see how well they hold up, but the Amazon reviews were positive.
I installed heated grips on a relay this winter, and while they're useless for riding below 35 degrees, over 35 they've made it much more enjoyable. I'm looking forward to using them on chilly summer nights.
$90? Nope, right now you can buy them on Amazon for less than $40.
I have the same pair.
I’ve had no issue with these in 2 years. Love them.
BikeMaster Heated Grips (7/8) https://www.amazon.com/dp/B009Z1KQ2M/ref=cm_sw_r_cp_api_fabc_YycYFbV68QRPG
I just got these, I really like them Bikemaster Heated Grips for 7/8in handlebars - One Size https://www.amazon.com/dp/B009Z1KQ2M/ref=cm_sw_r_cp_apa_4UzcAbH5S59NA