I sure don't want to lose any teeth on a $150 blade foolishly.
Alternatives would be a jigsaw or angle grinder, but a BS would be most accurate and easiest.
The tubing is 1.25" I want to cut a quarter inch from one wall for about a foot and then complete the cut at a 45*.
Perhaps being able to do the jigsaw or angle grinder outside is a vote in their favor.