Bellarmine: man in pure nature would be as we are, prone to vice, and could be denied healing grace
This is Bellarmine's teaching in chapter 7 of the book already cited. Answering the seventh objection there, he says that man created in a purely natural state would have been just as we are with respect to bodily mortality, the rebellion of the members, ignorance, difficulty and the like.
Later, answering the eighth objection, he denies that the natural drive of our flesh is more rebellious now than it would have been earlier without grace, and denies that man's purely natural endowments would have been any healthier before sin than they are now after it.
Further on he even grants that man could have been made in such a state of pure nature that he would have had a headlong bent toward vice and the drive of sensuality. And he insists that nothing absurd would follow if God refused a man so created the grace that heals these evils and that man needs to reach eternal blessedness.
Latin
XXII. Haec est Doctrina Bellarmini libri jam citati capite septimo. Ubi Respondens ad septimam objectionem affirmat, hominem in puris naturalibus conditum futurum fuisse quales nos sumus, quoad corporis mortalitatem, rebellionem membrorum, ignorantiam, difficultatem & similia. Et postea in solutione Objectionis octavae negat naturalem carnis nostrae impetum magis nunc esse rebellem, quam ante sine gratia futurus erat: & pura naturalia saniora futura fuisse ante peccatum, quam modo sint post peccatum. Adeoque in sequentibus concedit, hominem condi potuisse in tali purae naturae statu, ut in eo esset praeceps ad vitia inclinatio, & impetus sensualitatis. Et pertendit nihil absurdi sequuturum esse, si homini sic in puris naturalibus condito Deus negaret gratiam quae malis ejusmodi medetur, & homini necessaria est, ut ad beatitudinem aeternam perveniat.