Should be doable with lncli wallet bumpfee on your umbrel node. It can do both RBF and CPFP. The argument is <tx_you_want_to_bump>:<change output number> of your tx (if doing CPFP), not sure how to do RBF. This assumes there is a change output, you could have sent the whole output to Blixt wallet, then you would need to do CPFP on Blixt side. [...]
Thanks for the tip, we will add it to the schedule and do a review of the various marketplaces, getting non-kyc options out there drives liquidity and makes these services more valuable [...]