Plausibility check: Reformation avoided/weakened by "internal Reformation" during XV century?

Recently I have read this thread, and it was argued that some kind of "Reformation from inside" could have been carried out, and someone pointed out that it could have been achieved had the council of Constance accepted the teachings of Wycliffe and Hus instead of condemning them.
My question is: is this even possible? If so, how? And how would this affect Europe? Would there still be a schism(s) (albeit a smaller one)?

Thanks for your help.
Accepting moderate Hussitism (church services in vernacular languages, communion in both forms) is easy enough--in a sense, the attempts at Catholic-Orthodox reunion (like the Union of Brest) did that not much later. Politically, that's fairly hard to do since Hussitism was almost explicitly a Czech anti-German movement, and the Germans were rather closer to Rome than the Czechs were. But it could be done without too much theological trouble. And maybe it could take a lot of wind out of the Reformation's sails--if the Catholics are doing things in the vernacular, the incentive to jump ship is weakened. (though, alternatively, it is worth noting that Henry VIII's introduction of English to his church's liturgy and translation of the Bible into English had the opposite effect, encouraging more theological speculation and splintering, so this could backfire; not all Hussites were just Utraquists, after all)

Accepting Lollardry is not actually plausible, since Wycliffe explicitly rejected most of the sacraments and the priesthood.