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if it is slipping, it is going to be over the rear sprocket, not round the front chainring.
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Keep it indoors.
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In good conditions, rear brake doesn't do much. In wet, icy, slippery conditions, it is quite easy to cause a front wheel skid which is generally terminal. Recovering from a rear wheel skid is straightforward - some people even do it deliberately, for fun.
Brake cables also snap, especially if they live outside, are old, galvanised, unloved, etc.
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Can you just cut through the bolt with a grinder and a steel cutting disk? Subsequently, hard maybe to get the bottom half of the bolt out of the stem, but fast and lots of sparks.
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If you have a grinder and are a bit bored, you can cut open the old freewheel, liberate all the balls and achieve a deeper understanding of freewheel construction.
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There are sealed freewheels (WI, token, profile) and unsealed ones (dicta, shimano, halo, acs, etc.) The unsealed ones will all die if used in crappy weather (~1-2 years commuting) crap gets inside and the ball bearings start to wear faster, it becomes loose or the pawls stop catching or similar. Adding oil can extend their lives a bit. The WI ones are great but a bit of a false economy as you can buy 10 dicta type freewheels for one WI one, and the WI casing is quite expensive compared to the cost of a new WI freewheel (and the last time I did that I found they now only sell the new casing with a new bearing).
Get one that works with the standard 4 sprog removal tool.
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For gears , a derallieur (that bolts on to your hanger), cassette ((shimano) that has right number of gears for your hub), gear cable, gear outer, gear lever. You might want to get a bigger front chainring - it will be 110 or 130 bcd (probably). You could also add a front derallieur, chainrings, etc.
For gearing up generally this might be what you're looking for https://www.youtube.com/watch?v=Vwn_UfG2spc
halo aerorage is a suggestion. The rims and spokes are so-so, but the hubs are great.
https://www.merlincycles.com/mach-sealed-bearing-track-wheel-56098.html?utm_source=PHG&utm_medium=AffiliateMarketing&utm_campaign=phg-GB&ucpo=15854&source=PHG
That looks like novatec hub - missing the aluminium shield that the halo hub has, but cheap for an off the shelf wheel.
No idea if either would work with a 32mm tyre.