Quote: "... repented of grave sin through sacramental confession, in order to be able to receive Jesus in the Eucharist.
There's no "war" unless one believes that guarding the integrity of one's doctrine and dogma constitutes "war". The Catholic Church professes the dogma of transubstantiation. Protestants reject it. Given that, it seems to make much more sense for Protestants and Catholics to take Communion in a manner which reflects their respective beliefs rather than feigning a unity which doesn't exist.
The "war" here, if there is one, is against the traditional teaching of the Catholic Church by some who call themselves Catholics. There is no campaign among Protestants to receive Catholic Communion and therefore there is no rebuff for them.
Becoming Catholic and accepting the Church's teaching is and always has been the simple solution for those who wish to receive Holy Communion.