I visited Glacier NP last year as part of a group nature study and hiking week at the Glacier Institute. The schedule did not allow for any activations, my bad luck. But I did stop in Apgar ranger station one afternoon to research for a possible future trip. The rangers I spoke with were completely unaware of SOTA, so I hope I left a good first impression. From them I learned that many peaks in the park do not have "official " summit trails, and in some cases that is because the rock isn’t stable. Based on my conversations, you might consider going to the West Glacier visitors center or the ranger station, explain what you hope to do, and ask for suggestions. Have your own map handy to make notes and highlight trails. They may ask you what equipment you have and what your experience is, so they can make appropriate suggestions. Depending on conditions, some trails may be closed due to late snow melt (it happened to us), and the rangers will know the situation.
Finally, you probably are aware that Glacier is well known for its population of grizzly bears. A concessionaire in the park does a thriving business renting bear spray canisters, and as I recall the cost was such that 2 or 3 days rental cost was equivalent to the cost of buying your own canister - the Kalispell Walmart seemed to have one of the best prices I saw, but the canisters can be bought at just about any outfitter. If you do buy, be aware that you can’t take it on an airplane if you fly home.
I can’t advise you on whether to buy one, but if you are venturing out on the trails and in the backcountry please do learn how to manage a meeting with a grizzly, and if you carry a canister, learn how to use it properly. For the record, in 6 days of day hiking from car accessible trailheads (no remote backpacking) we encountered black bears 3 times and grizzly once - but the grizzly was a sow with 2 cubs, coming down our trail. We turned around and retreated to a side trail until they went back off the trail. Our naturalist guides carried bear spray but we fortunately didn’t have to use it in any of our encounters. Always best to avoid confrontation.
Have a great trip!