I will separate from the pack of good advice and go with CRG "nope" here.
TLDR:
Practice. Practice. Practice.
One should not shy from *planning* two cuts instead of one, first cutting say 1/2" from where needed to validate the result/technique.
This is a topic of technique and cannot be bypassed by any utensil. Short of the table-sized ones ...
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Thing is, *no* accessory which prevents the saw from tipping could give the saw adequate stability during the cut.
The only precise surface on a rail is the reference rib and no (thin) rail can have a 2nd vertically-aligned reference surface strong-enough to handle the forces during a 45° bevel cut. A steady and well aplied pressure by the operator is a physics requirement here.
This is why I despise Makita-style "anti-tip" nips on the rails and such. These are useless during the cut and only create the false impression (in a novice) that one can rely on them for someting else than the saw not falling off. Plus it promotes the (bad) practice of "storing" the saw on the rail while lining things up (see bellow).
What I found as the "best pratice" is to not "store" the saw on the rail before the cut. Period. Line up everything first and only then come with the saw to make the cut in a single operation.
Any fiddling with the heavy saw on the rail is likely to move things in undesirable ways. Even when clamping, the heavy saw causes the adhesive strips to stick, and boy, they do stick. This forces a bend of rail when lining up which is then "fixed in" by the clamps. This is bad for 90° cuts, not to mention bevel ones. *)
*) yes, yes, when doing a plunge cut one needs the saw to set the stops. But then even a 90° plunge cut asks for a beforehand-clamped rail, etc.