Retrofit eaves comb from inside loft space

[jayc89]

Our eaves are currently open to the world (1850's roof). Whilst re-insulating it, I'd like to fit something like a length of eaves comb to prevent birds nesting in it again next year. It looks like most combs are installed by lifting the first row of slates/tiles, which would be a problem for me as I can't get around the full roof from outside. Are there any that can be fitted from within the loft space, similar to refurbishment eaves vents?