Yes I would agree with BSA 54A10 -
"As for K linners.
I would have no worries about fitting them to the inlets.
However I have heard of a few where the exhaust either grabbed the valve or got dragged out by the valve.
Weather they were done by some one competant with air cooled engines is another question."
Yes I would agree that it is risky on the exhaust side of the A10 - Both of mine went. I found one mushroomed, as it had been pushed down a half inch or son, I found the other in the exhaust pipe! Don't know how long I was driving around like that, my last trip was a 500 miles round trip up the the extreme north west of Scotland, then back to civilisation. She went beautifully all day.
When I took the head back to my engineer, who fitted the k liners a few years previoiusly, he was initially stumped. He's fitted thousands over the years to all sorts of engines, and up until that point he only had one that slipped. I trumped that with 2 in one engine! After a bit of thought, and looking at the state of the head, it looked like I had been running far to hot, either a timing or mixture fault. (fixed now) This would have expanded the valve stems which then nipped the liners and moving them. Standard guides now fitted to exhaust, the inlets still have the liners in them, they will probably out last me. If the engine wasn't run so hot, the exhaust liners would still be in place.