In my experience most overwintered chillies sulk so much in spring that they get overtaken by seedlings. But then I'm in the UK - probably no problem in a mediterranean climate where apparently the tree types (habanero arbol etc.) reach 2 or 3 metres.
There are two less-common species that are supposed to be significantly more perennial:
C.baccatum (odd fluted shapes with 2 tone yellow/white flowers - bishops caps, bulgarian teardrop etc.) and
C.pubescens (Very thick-walled blocky or cone shapes with hairy foliage and purple flowers - manzanos, locotos, rocotos).
However I find the baccatums are not much less sulky than the tree types.
The manzano/locoto types take off like a rocket in their 2nd, 3rd spring and leave my seedlings for dead. However they are very late in their 1st year and only tend to produce in their 2nd, 3rd years etc. To compensate they will produce then even if their 2nd 3rd summer is so bad that all the other species' seedlings do nothing.
You can definitely make an advantage of a dud first year by not sowing them until April when your ordinary seedlings are starting to release your propagators, frames etc. This also gives you smaller more juvenile plants that are easier to overwinter.
Cheers.
PS. if you really want to overwinter a sweet pepper then the "chiquita" "mini sweet" types are as reliable as any of the hotter C.annuums.