indo-european bears

If the PIE word *h₂r̥tk̑os ‘bear’ (Greek άρκτος, Latin
ursus) had survived into Germanic and down to modern English, what
would it have looked like?

On the face of it, you might guess a Germanic form *urþkaz --> English
‘orthk’. That looks very wrong, but I can't work out which
phonological rule would prevent it.

If the -tk- metathesized to -kt- (which it did in Greek – but why
would it in Germanic exactly?), then you'd get a more plausible
Germanic *urxtaz, which might have given English *orght, or perhaps
*rought.

Any comments? I am not an expert so any comments on the sound changes
I might have misunderstood or forgotten about would be helpful.

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