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A good bootfitting shop will have the tools to stretch some length into a boot shell - but they cannot do a lot - maybe 1 size. Not a good situation
They heat the toe and use a pressure stretcher to stretch out the (length) of the toebox until it cools. Normally they would do the width... They maybe able to put some room / length into the heel. I saw a pair of Lange's done...maybe 1/2 size.
Then there is grinding out the toe....but it is had to get the grinding ball right in there.
See what the shop says - what tools they have...
U cannot do much because as mentioned it may eventually interfere with the binding mount / release.
The boot sole remains the same / untouched. They got to do a little at a time so as not to warp the whole boot.
The liner will still need to be stretched or cut or the just cut the stitches to release it. - or u may need to buy the next size up...or it maybe compressed and maybe u can deal with it.
A bigger foot usually means longer and wider so u may need more than expected work...
This year's Solomon's have a boot pillow / crash bag in the toe - check it out. good luck