if u try to complete ur 10y by postponing ur hearing date then it wont help ur long residency application anyway. the moment u apply for LR whilst appeal pending against a decision then ur file will be linked to the outcome of ur appeal
so no way u can avoid ur appeal and go for LR.
If the applicant has an outstanding appeal against a decision to refuse leave to remain or indefinite leave to remain, and submits an application for long residence, you must void the case and refund the fee.
Ur LR application will be considered only once u get appeal decided.