Have you heard of Lingua Franca Nova? LFN is one of the Romance-based conlangs (or Interlingua clones) that has a "Toki Pona -like" feel or vibe to it!
LFN is a relatively recent conlang (first presented in 1998). Its vocabulary is based on Romance languages (French, Spanish, Portuguese, Catalan, Italian etc.) and it has a creole/pidgin like (or Chinese like) grammar. You can say LFN is like a hybrid between Esperanto and Toki Pona! LFN has a beautiful sound!
The verbs (and other words) rarely change form, there is very little inflection (e.g. there is no accusative case) and there is a word order.
Unlike Interlingua, LFN doesn't go too far in the direction of naturalism (Interlingua has irregular spelling, irregular verbs etc.).
Tell me what you think.