it’s not the soldiers going to Belarus, it was only offered to pregozhin himself… if this is on the level

I would be surprised if Pregozhin voluntarily abandons what makes him indispensable to Putin. Without his armed forces, Pregozhin is just an impotent loudmouth in a sea of impotent loudmouths. He's setting himself up for defenestration if he goes that route.

What if this is all an elaborate ruse to redeploy Wagner to Ukraine's northern border?

Prigozhin is pissed off at Russia's Ministry of Defense. He thinks they suck. Russian MoD is pissed off at Wagner. They really wish Prighozin would forget his social media passwords and STFU. Prigozhin "mutinies" by taking Rostov-on-Don. A couple of MoD choppers were supposedly shot down, but for the large part, very few casualties. Putin looks angry. Claims to have been "stabbed in the back". Lukashenko of Belarus "brokers a peaceful resolution", and Pregozhin and his Wagnerites agree to go to Belarus.

... in exile? I doubt it.

This looks like a winning situation for everyone concerned. Russian MoD finally get the Wagnerites out of their hair. Wagner ends up in Belarus for a much-needed resupply of equipment and perhaps some Belarusan soldiers / convicts. Putin saves face. Lukashenko looks competent.

What if Wagner subsequently decides to re-enter the fray, but this time from Ukraine's northern border? Kyiv and Lviv are closer to Belarus than they are to Russia.

Hmmm....