Bow in thread currently gets braced with primitive stringer from over 11" of reflex.It takes a steady hand to get the job done,but a lot faster and more convenient yet then using the peg board,or even the more portable peg board shown in thread.Reading the entire thread will show this.
Going beyond 12" does make things more unsteady yet so to speak,but I've done it enough times I know it's doable consistently.Once a person gets the handle to tips' height while stringing stability is a lot more stable.Getting there is where it takes a steady hand.
The stringing grooves of limb tips are there as an insurance because it is considered an actual recurve in the definition of recurves with the string resting on 2" of the tips belly.It might be that they were not needed.They are on there as an insurance.Tremendous stored energy there.Stringing grooves do not bother me in the looks department.Grooving them in did not compromise the strength any if that is your question.It still is at least 1/2" thickness of tips where the string grooves are located.I use a 3 ply fast flight string.
I will say though that stringing a horn bow this way works fine for under 60#'s.When a person gets to 80,90,or 100#'s it becomes more difficult yet.I would say a peg board or tepeliks are your options then just for safety's sake.
PS...Making a bow press would be a god thing.