I see Welcome Centers as the most troublesome since they may give a bad impression to brand new players. For Welcome Centers - tribe at least 2 months old, must have an active subscriber or the Welcome Center goes inactive, must be approved by a guide.
Infirmaries are less troublesome since trapped players can die again quickly if they don't eat and drink. Set by tribes at least one month old, able to be removed by guides.
I don't see how tying to script a clear path off tribe land would be worth the effort of coding.